sectorn.

Brit.

/ˈsɛktə/, U.S.

/ˈsɛktər/

Etymology: < late Latin sector (Boethius), a special use of Latin sector (agent-noun < secāre to cut), to translate Greek τομεύς, lit. ‘cutter’, but used by Archimedes and later geometers in the senses 1a, 1b Compare French secteur, Spanish sector, Italian settore.

I. A division or portion, and related uses.

1. Geometry.

a. A plane figure contained by two radii and the arc of a circle, ellipse, or other central curve intercepted by them.

ΘΚΠ

the world > relative properties > number > geometry > shape or figure > [noun] > two-dimensional > figure forming part of circle

nook cantle1551

quadrate1551

quadrant1559

section1570

sector1570

segment1570

sextant1628

half-round1718

octant1753

1570 H. Billingsley tr. Euclid Elements Geom. iii. f. 82^v A Sector of a circle.

1660 tr. I. Barrow Euclide's Elements iii. 51 A sector of a circle..is when an angle..is set at the centre..of that circle.

1834 Nat. Philos. (Libr. Useful Knowl.) III. Hist. Astron. xvi. 85/1 The sector described by its radius vector in a given time round the earth is not changed.

1880 Williamson in Encycl. Brit. XIII. 50/2 The area of the elliptic sector APCP.

b. sector of a sphere: a solid generated by the revolution of a plane sector about one of its radii. Also spherical sector.

ΘΚΠ

the world > relative properties > number > geometry > shape or figure > [noun] > three-dimensional > formed by cutting solid

segment of a sphere1570

sector of a sphere1656

frustum1658

truncated cone or pyramid1704

frustulum1785

wedge1883

1656 tr. T. Hobbes Elements Philos. iii. xxiii. 276 The center of Equiponderation of the Sector of a Sphere.

1706 Phillips's New World of Words (new ed.) Sector of a Sphere, is a Conical Solid, whose Vertex or Top ends in the Center of the Sphere, and its Base, or Bottom, is a Segment of the same Sphere.

1840 D. Lardner Treat. Geom. 217 The sector of a sphere consists of a cone and a spherical segment.

2. A body or figure having the shape of a sector; hence, a division or part, a unit.

a. gen. Any piece of mechanism so shaped.

ΘΚΠ

the world > space > shape > other specific shapes > [noun] > sector- or segment-shaped object

segment1646

sector1715

sector-piece1715

society > occupation and work > equipment > machine > parts of machines > mechanism > [noun] > other specific mechanisms

stop?1523

clockwork1652

sector1715

rackwork1755

scapement1789

scape1798

safety catch1827

controller1836

dog1840

Geneva stop1841

Maltese cross1852

throw-off1852

gearhead1869

tripper1870

Scotch yoke1880

Geneva movement1881

belt-tightener1882

watch1882

selector1890

Geneva wheel1891

throw-out1894

Geneva motion1897

horse-geara1899

Geneva mechanism1903

safety catch1904

Geneva drive1913

Geneva1919

Possum1961

1715 J. T. Desaguliers tr. N. Gauger Fires Improv'd 122 At the under side of this Trap-Door, on each side have a small portion of a Circle, or a Sector, whose Center is at that part of the Trap-Door where the Hinge is.

1824 ‘R. Stuart’ Descr. Hist. Steam Engine 145 The double impulse was communicated to the working-beam by the intervention of a sector placed on the end of the pump-rod, working into a sector placed on the end of the working-beam.

1904 Brit. & Col. Printer 10 Mar. 14/2 A toothed sector having a pin and slot connection with it gives the required shift to the slide.

b. Optics. A division of a disc of paper or other material used in certain demonstrations.

ΚΠ

1831 D. Brewster Treat. Optics vii. 70 The same result will be obtained, if we take a circle of paper and divide it into sectors of the same size as the coloured spaces.

1871 J. Tyndall Fragm. Sci. xiv. 423 A disk with differently-coloured sectors is caused to rotate rapidly.

c. Astronomy. (See quot. 1863.)

ΘΚΠ

the world > the universe > constellation > comet or meteor > comet > [noun] > head > sector

sector1840

jet1847

1840 T. Dick Sidereal Heavens 447 It appears..that one of these luminous fans or sectors was observed by Sir J. Herschel.

1863 Hind Introd. Astron. (ed. 3) 205 Sector, Luminous, in the head of a comet, is an emanation from the nucleus brighter than the rest of the coma in the form of a fan or sector.

d. A small piece of ebonite forming part of a Bertsch machine.

ΘΚΠ

the world > matter > physics > electromagnetic radiation > electricity > transmission of electricity, conduction > non-conduction, insulation > [noun] > substance or contrivance

non-conductor1751

insulator1801

dielectric1837

bushing1839

insulation1870

sector1894

insulant1934

1894 S. R. Bottone Electr. Instr. Making (ed. 6) 40 This little piece of ebonite (technically known as the ‘sector’) and its stand must be attached to the base board... Opposite this sector, but on the other side of the glass plate, is a ‘comb’.

e. Pathology. A portion of the field of vision cut off in certain diseases of the optic nerve.

ΘΚΠ

the world > health and disease > ill health > a disease > disorders of eye > disordered vision > [noun] > limited visual field > sector cut off

sector1899

1899 T. C. Allbutt et al. Syst. Med. VI. 842 There was enormous swelling of the left optic nerve, coupled with loss of a large sector of the temporal portion of the field [of vision].

f. Entomology. (See quot. 1861.)

ΘΚΠ

the world > animals > invertebrates > phylum Arthropoda > class Insecta > parts of insects > [noun] > wings(s) > nervure > longitudinal nerve

sector1861

1861 H. Hagen Synopsis Neuroptera N. Amer. 343 Sectors, longitudinal nerves which strike the principal nerves at an angle, and usually reach the apex or hind margin of the wing.

(a) Military. A part or section of a front, corresponding generally to a sector of a circle the centre of which is a headquarters.

ΘΚΠ

society > armed hostility > armed encounter > battlefield > [noun] > front or front line > part of

sector1916

1916 ‘B. Cable’ Action Front 237 The Colonel was..vainly trying to recall any sap-head within his sector of line.

1917 W. J. Locke Red Planet xiv. 161 Somewhere in this region—or sector, as we call it nowadays—there was a certain bit of ground that had been taken and retaken over and over again.

1918 E. S. Farrow Dict. Mil. Terms s.v. The combination of several supporting points under one commander forms a sector.

1930 S. Sassoon Mem. Infantry Officer iv. 61 Rose Trench..and Willow Avenue, were among the first objectives in our sector [of the Somme attack].

(b) A part or branch of an economy, or of a particular industry or activity. Frequently in phrases private sector n. at private adj.¹, adv., and n. Compounds 2, public sector n. at public adj. and n. Compounds 1b.

ΘΚΠ

the world > relative properties > wholeness > incompleteness > part of whole > [noun] > one of the parts into which anything is divided > of a subject or action > of an industry or activity

sector1937

1937 A. Huxley Ends & Means xii. 196 The accomplished intellectual understands the relations subsisting between many sectors of apprehended reality.

1950 Hansard Commons 7 Mar. 183 Every Member of this House..could point to examples of gross feather bedding both in Government Service, in the socialised sector of the economy and in private industry.

1959 Listener 5 Nov. 767/2 Problems of a comparable nature in other sectors of industry.

1964 Ann. Reg. 1963 195 The Government's failure to carry out its declared aims—land reform..and planned development in all sectors of the economy—was to some extent caused by the President's readiness to yield too easily to pressure.

1980 Sci. Amer. Sept. 134/1 This development is the outcome of an explicit long-term policy to establish an adequate indigenous capacity in all the basic sectors, particularly metals and machinery, heavy chemicals.

ΘΚΠ

the world > the earth > region of the earth > [noun]

endc893

earthOE

coastc1315

plagea1382

provincea1382

regiona1382

countrya1387

partya1387

climatea1398

partc1400

nookc1450

corner1535

subregion1559

parcel1582

quart1590

climature1604

latitudea1640

area1671

district1712

zone1829

natural region1888

sector1943

1943 H. A. Wallace Cent. Common Man (1944) 82 The ignorance that clouds many communities in many sectors of our own nation.

1958 Listener 9 Oct. 547/1 It has recently become fashionable to divide the Middle East into two major entities: the Arab sector and the non-Arab sector.

1971 Daily Tel. 12 Apr. 2/1 Experts believe nearly half of the country's daily oil consumption will be produced from the British sector of the sea by 1976.

h. Computing. A subdivision of a track on a magnetic drum or disc, or the block of data stored on it.

ΚΠ

1958 Computer Jrnl. 1 128/1 Information is stored on ‘sectors’, each capable of containing 32 numbers... There are 1,024 such sectors, two to each track on a drum.

1962 Gloss. Terms Automatic Data Processing (B.S.I.) 68 Sector, a specified part of a track or band on a magnetic disc or drum store: hence, in programming, a deprecated alternative name for a block applied to the group of words stored on a sector.

1976 G. Wiederhold Database Design ii. 40 If tracks cannot be divided by hardware into sectors, system software may divide a track into smaller units.

i. Grammar. The position in a sentence normally occupied by any one of the basic units of which the sentence is composed. Cf. sector analysis n. at Compounds 2 below.

ΚΠ

1955 E. H. Jorden Syntax Colloq. Japanese v. 13 Evidence furnished by focus-classes indicates that minor sector boundaries should be observed even here—that the IC division should occur between the gerund of the copula and the following verb, where the sector boundary occurs.]

1966 R. L. Allen Verb Syst. Present-day Amer. Eng. iii. 88 An examination of a large number of sequences suggests that in most non-literary sentences there is a kind of ‘spectrum’ of basic positions, which may be called ‘sectors’.

1968 R. Crymes Some Syst. Substitution Correlations in Mod. Amer. Eng. ii. 36 The major positions in the major English sentence, which is a sentence having time orientation ..exist in fixed sequence, and they are called sectors.

1974 Chisholm & Milic Eng. Lang. vii. lii. 424 According to the grammatical description called Sector Analysis, the English sentence consists of ten sectors.

II. A scientific instrument.

3. A mathematical instrument, invented by Thomas Hood (see quot. 1598) and improved by Edmund Gunter, used for the mechanical solution of various problems.In its present form it consists of two flat rules stiffly hinged together, inscribed with various kinds of scales. In Hood's form, a graduated arc was an essential part of the instrument, and from some of the inventor's remarks it would appear that the name was given with reference to the form of the apparatus (see sense 1), not, as might be supposed, to its function in performing proportional division of lines.

ΘΚΠ

the world > relative properties > number > mathematical instruments > [noun]

mathematical instrument1588

rectificatory1593

pantometer1597

sector1598

holometer1696

multiplier1875

horn-centre1879

1598 T. Hood Making & Vse of Sector 1 A Sector is a mathematicall instrument consisting of 2. feete, one moueable, an other fixed, making an angle, and of a circumferentall Limbe.

1623 E. Gunter (title) The description and use of the sector, the crosse-staffe, and other instruments.

1673 E. Browne Brief Acct. Trav. Hvngaria 18 By applying an Instrument joynted like a Carpenters Rule, or a Sector, the Skin is held fast.

1766 Compl. Farmer at Surveying If a little error be committed in making up the sector, the most of it goes off again in the substraction of the triangle.

1803 Philos. Trans. (Royal Soc.) 93 387 In the sector I am going to describe, Mr. Ramsden has obviated the inconveniences attendant on the use of former sectors.

1881 F. J. Britten Watch & Clockmakers' Handbk. (ed. 4) 24 The sector is really a proportional measuring gauge, suited for nearly all requirements of the watch and clockmaker.

attributive.1694 J. Atkinson Wakely's Mariners-compass Rectified (new ed.) 273 All Sector-Lines or Scales, meet at the center of the Head (where the Joint is) at the left-hand, and from thence are figured towards the right, each being twice repeated; that is, one on each Leg or Side of the Sector answering one another.1694 J. Atkinson Wakely's Mariners-compass Rectified (new ed.) 274 The Use of the Sector-Lines for Projection.

4. An astronomical instrument consisting of a telescope turning about the centre of a graduated arc. See dip-sector n., zenith sector n.

ΘΚΠ

the world > the universe > cosmology > science of observation > astronomical instruments > observational instruments > [noun] > telescope

sector1711

astronomical telescope1723

sweeper1786

comet seeker1819

photo-telescope1893

Schmidt–Cassegrain1943

space telescope1953

photopolarimeter1971

1711 T. Hearne Remarks & Coll. (1889) III. 129 By my Sector it is but 141.

1755 Gentleman's Mag. Nov. 511/1 A sector of six feet radius, whose divided arc was somewhat more than 51 degrees.

1843 Penny Cycl. XXVII. 765/2 Bradley's sector as originally made was not reversible, and therefore only fit for measuring differences or variations.

1877 G. F. Chambers Handbk. Descr. Astron. (ed. 3) 920 Sector, astronomical, an instrument for finding the distance between two objects whose distance is too great to be measured by means of a micrometer in a fixed telescope.

Compounds

C1. General attributive.

sector-like adj.

ΚΠ

1899 T. C. Allbutt et al. Syst. Med. VII. 318 Occasionally, instead of complete blindness of one-half of the visual field, sector, or quadrant-like defects are found in the upper or lower half.

sector-shaped adj.

ΚΠ

1902 Orde-Browne Armour in Encycl. Brit. XXV. 670/2 The joints shown in this figure indicate that the turret roof is built up of fifteen sector-shaped pieces.

C2.

sector analysis n. Grammar the analysis of sentences in terms of the positions occupied by the basic units of which they are composed (cf. sense 2i above).

ΚΠ

1966 R. L. Allen Verb Syst. Present-day Amer. Eng. iii. 88 The order..of the occupied sectors remains constant... Many of the details of this ‘sector’ analysis lie beyond the scope of the present study.

1971 D. T. Bình Tagmemic Comparison Struct. of Eng. & Vietnamese Sentences iii. 66 Sector analysis..primarily emphasizes the positions of units on the sentence, trunk, and predicate..levels.

1977 Amer. Speech 1975 50 127 Only the concluding chapters give any attention to the problems of composition, and much of this is a discussion of sector analysis.

sector machine n. (see quot. 1888).

ΚΠ

1888 C. T. Jacobi Printers' Vocab. 121 Sector machine, a cylindrical printing machine.

sector-piece n. a sector-shaped portion of any object.

ΘΚΠ

the world > space > shape > other specific shapes > [noun] > sector- or segment-shaped object

segment1646

sector1715

sector-piece1715

1715 J. T. Desaguliers tr. N. Gauger Fires Improv'd 122 Fix a couple of Springs under the Frame, each of which must bear against the Limbs of the Sector-Pieces.

1902 Orde-Browne Armour in Encycl. Brit. XXV. 670/2 Before adoption a sector piece was subjected to three blows from projectiles fired from an Elswick 100-ton breech-loading gun.

sector scan n. (frequently attributive with hyphen).

ΚΠ

1946 Radar: Summary Rep. & Harp Project (U.S. National Defense Res. Comm., Div. 14) 143/2 Sector scan, motion of the scanner reflector back and forth through a limited angle, instead of through 360°.

1969 R. P. Selby in C. J. Richards Mech. Engin. in Radar & Communications ix. 387 Radar installations used for air-traffic control are sometimes required to operate on demand in sector-scan mode, the area of scan usually not exceeding 20° and the rate of scan approximately 20 scans per minute.

1978 Nature 9 Nov. 174/1 A simple sector scan mode is used, at a frequency of 1 Hz, with the target coupled acoustically to the transducer with water.

sector scanning n. scanning with radar, sonar, or the like in which the detector rotates to and fro through a fixed angle.

ΚΠ

1946 Princ. & Applic. of Underwater Sound (U.S. Nat. Defense Res. Comm.) (1968) xi. 213/1 A plan position indicator is..required for sector scanning, the CRO spot..tracing a synchronous map of the motion of the active region.

1969 R. P. Selby in C. J. Richards Mech. Engin. in Radar & Communications ix. 386 It is sometimes required to move an antenna system about a vertical axis in an oscillatory mode (sector-scanning), thereby turning the antenna through a limited arc in either direction.

1974 Y. Kikuchi in G. W. Stroke et al. Ultrasonic Imaging & Holography 267 Asberg has been proposing a high speed sector scanning of a focusing mirror system receiver for obtaining an ultrasonic cinematogram of the living heart.

1977 Navy News July 18/2 Because the number of wrecks on our continental shelf is so high..modern equipment such as Hydrosearch—the British sector-scanning surveying sonar—is particularly needed.

Draft additions 1993

Aeronautics. A route or journey flown non-stop by a commercial airline, often as part of a longer flight schedule.

ΘΚΠ

society > travel > air or space travel > transport by air > [noun] > regularly timed journey > non-stop journey, part of flight schedule

sector1950

1950 Stroud & Mearles in James & Stroud World's Airways ii. 56/1 It was for the operation of the Singapore–Brisbane sector that the D.H.86 was designed.

1961 Observer 12 Feb. 1/5 The pilots claim that the four ‘sectors’ a day allotted to Comet pilots under the summer schedules are ‘too much’. A ‘sector’ is the journey between a take-off and a landing.

1976 Aviation Week 16 Feb. 22/3 For Europe in 1990, the predicted total of 435 billion seat miles offered is expected to be broken down to 250 billion seat miles for long-range routes and 185 billion seat miles on short/medium-range sectors.

1986 Aircraft Illustr. July 374/2 The series 3A-RA and 3B-RA had a range..of 1,770 statute miles, permitting..an unrefuelled sector from London to Istanbul.

This entry has not yet been fully updated (first published 1911; most recently modified version published online March 2022).

单词	sector
释义	sectorn. Brit. /ˈsɛktə/, U.S. /ˈsɛktər/ Etymology: < late Latin sector (Boethius), a special use of Latin sector (agent-noun < secāre to cut), to translate Greek τομεύς, lit. ‘cutter’, but used by Archimedes and later geometers in the senses 1a, 1b Compare French secteur, Spanish sector, Italian settore. I. A division or portion, and related uses. 1. Geometry. a. A plane figure contained by two radii and the arc of a circle, ellipse, or other central curve intercepted by them. ΘΚΠ the world > relative properties > number > geometry > shape or figure > [noun] > two-dimensional > figure forming part of circle nook cantle1551 quadrate1551 quadrant1559 section1570 sector1570 segment1570 sextant1628 half-round1718 octant1753 1570 H. Billingsley tr. Euclid Elements Geom. iii. f. 82^v A Sector of a circle. 1660 tr. I. Barrow Euclide's Elements iii. 51 A sector of a circle..is when an angle..is set at the centre..of that circle. 1834 Nat. Philos. (Libr. Useful Knowl.) III. Hist. Astron. xvi. 85/1 The sector described by its radius vector in a given time round the earth is not changed. 1880 Williamson in Encycl. Brit. XIII. 50/2 The area of the elliptic sector APCP. b. sector of a sphere: a solid generated by the revolution of a plane sector about one of its radii. Also spherical sector. ΘΚΠ the world > relative properties > number > geometry > shape or figure > [noun] > three-dimensional > formed by cutting solid segment of a sphere1570 sector of a sphere1656 frustum1658 truncated cone or pyramid1704 frustulum1785 wedge1883 1656 tr. T. Hobbes Elements Philos. iii. xxiii. 276 The center of Equiponderation of the Sector of a Sphere. 1706 Phillips's New World of Words (new ed.) Sector of a Sphere, is a Conical Solid, whose Vertex or Top ends in the Center of the Sphere, and its Base, or Bottom, is a Segment of the same Sphere. 1840 D. Lardner Treat. Geom. 217 The sector of a sphere consists of a cone and a spherical segment. 2. A body or figure having the shape of a sector; hence, a division or part, a unit. a. gen. Any piece of mechanism so shaped. ΘΚΠ the world > space > shape > other specific shapes > [noun] > sector- or segment-shaped object segment1646 sector1715 sector-piece1715 society > occupation and work > equipment > machine > parts of machines > mechanism > [noun] > other specific mechanisms stop?1523 clockwork1652 sector1715 rackwork1755 scapement1789 scape1798 safety catch1827 controller1836 dog1840 Geneva stop1841 Maltese cross1852 throw-off1852 gearhead1869 tripper1870 Scotch yoke1880 Geneva movement1881 belt-tightener1882 watch1882 selector1890 Geneva wheel1891 throw-out1894 Geneva motion1897 horse-geara1899 Geneva mechanism1903 safety catch1904 Geneva drive1913 Geneva1919 Possum1961 1715 J. T. Desaguliers tr. N. Gauger Fires Improv'd 122 At the under side of this Trap-Door, on each side have a small portion of a Circle, or a Sector, whose Center is at that part of the Trap-Door where the Hinge is. 1824 ‘R. Stuart’ Descr. Hist. Steam Engine 145 The double impulse was communicated to the working-beam by the intervention of a sector placed on the end of the pump-rod, working into a sector placed on the end of the working-beam. 1904 Brit. & Col. Printer 10 Mar. 14/2 A toothed sector having a pin and slot connection with it gives the required shift to the slide. b. Optics. A division of a disc of paper or other material used in certain demonstrations. ΚΠ 1831 D. Brewster Treat. Optics vii. 70 The same result will be obtained, if we take a circle of paper and divide it into sectors of the same size as the coloured spaces. 1871 J. Tyndall Fragm. Sci. xiv. 423 A disk with differently-coloured sectors is caused to rotate rapidly. c. Astronomy. (See quot. 1863.) ΘΚΠ the world > the universe > constellation > comet or meteor > comet > [noun] > head > sector sector1840 jet1847 1840 T. Dick Sidereal Heavens 447 It appears..that one of these luminous fans or sectors was observed by Sir J. Herschel. 1863 Hind Introd. Astron. (ed. 3) 205 Sector, Luminous, in the head of a comet, is an emanation from the nucleus brighter than the rest of the coma in the form of a fan or sector. d. A small piece of ebonite forming part of a Bertsch machine. ΘΚΠ the world > matter > physics > electromagnetic radiation > electricity > transmission of electricity, conduction > non-conduction, insulation > [noun] > substance or contrivance non-conductor1751 insulator1801 dielectric1837 bushing1839 insulation1870 sector1894 insulant1934 1894 S. R. Bottone Electr. Instr. Making (ed. 6) 40 This little piece of ebonite (technically known as the ‘sector’) and its stand must be attached to the base board... Opposite this sector, but on the other side of the glass plate, is a ‘comb’. e. Pathology. A portion of the field of vision cut off in certain diseases of the optic nerve. ΘΚΠ the world > health and disease > ill health > a disease > disorders of eye > disordered vision > [noun] > limited visual field > sector cut off sector1899 1899 T. C. Allbutt et al. Syst. Med. VI. 842 There was enormous swelling of the left optic nerve, coupled with loss of a large sector of the temporal portion of the field [of vision]. f. Entomology. (See quot. 1861.) ΘΚΠ the world > animals > invertebrates > phylum Arthropoda > class Insecta > parts of insects > [noun] > wings(s) > nervure > longitudinal nerve sector1861 1861 H. Hagen Synopsis Neuroptera N. Amer. 343 Sectors, longitudinal nerves which strike the principal nerves at an angle, and usually reach the apex or hind margin of the wing. g. (a) Military. A part or section of a front, corresponding generally to a sector of a circle the centre of which is a headquarters. ΘΚΠ society > armed hostility > armed encounter > battlefield > [noun] > front or front line > part of sector1916 1916 ‘B. Cable’ Action Front 237 The Colonel was..vainly trying to recall any sap-head within his sector of line. 1917 W. J. Locke Red Planet xiv. 161 Somewhere in this region—or sector, as we call it nowadays—there was a certain bit of ground that had been taken and retaken over and over again. 1918 E. S. Farrow Dict. Mil. Terms s.v. The combination of several supporting points under one commander forms a sector. 1930 S. Sassoon Mem. Infantry Officer iv. 61 Rose Trench..and Willow Avenue, were among the first objectives in our sector [of the Somme attack]. (b) A part or branch of an economy, or of a particular industry or activity. Frequently in phrases private sector n. at private adj.¹, adv., and n. Compounds 2, public sector n. at public adj. and n. Compounds 1b. ΘΚΠ the world > relative properties > wholeness > incompleteness > part of whole > [noun] > one of the parts into which anything is divided > of a subject or action > of an industry or activity sector1937 1937 A. Huxley Ends & Means xii. 196 The accomplished intellectual understands the relations subsisting between many sectors of apprehended reality. 1950 Hansard Commons 7 Mar. 183 Every Member of this House..could point to examples of gross feather bedding both in Government Service, in the socialised sector of the economy and in private industry. 1959 Listener 5 Nov. 767/2 Problems of a comparable nature in other sectors of industry. 1964 Ann. Reg. 1963 195 The Government's failure to carry out its declared aims—land reform..and planned development in all sectors of the economy—was to some extent caused by the President's readiness to yield too easily to pressure. 1980 Sci. Amer. Sept. 134/1 This development is the outcome of an explicit long-term policy to establish an adequate indigenous capacity in all the basic sectors, particularly metals and machinery, heavy chemicals. (c) gen. One of the regions or districts into which a geographical area has been divided. ΘΚΠ the world > the earth > region of the earth > [noun] endc893 earthOE coastc1315 plagea1382 provincea1382 regiona1382 countrya1387 partya1387 climatea1398 partc1400 nookc1450 corner1535 subregion1559 parcel1582 quart1590 climature1604 latitudea1640 area1671 district1712 zone1829 natural region1888 sector1943 1943 H. A. Wallace Cent. Common Man (1944) 82 The ignorance that clouds many communities in many sectors of our own nation. 1958 Listener 9 Oct. 547/1 It has recently become fashionable to divide the Middle East into two major entities: the Arab sector and the non-Arab sector. 1971 Daily Tel. 12 Apr. 2/1 Experts believe nearly half of the country's daily oil consumption will be produced from the British sector of the sea by 1976. h. Computing. A subdivision of a track on a magnetic drum or disc, or the block of data stored on it. ΚΠ 1958 Computer Jrnl. 1 128/1 Information is stored on ‘sectors’, each capable of containing 32 numbers... There are 1,024 such sectors, two to each track on a drum. 1962 Gloss. Terms Automatic Data Processing (B.S.I.) 68 Sector, a specified part of a track or band on a magnetic disc or drum store: hence, in programming, a deprecated alternative name for a block applied to the group of words stored on a sector. 1976 G. Wiederhold Database Design ii. 40 If tracks cannot be divided by hardware into sectors, system software may divide a track into smaller units. i. Grammar. The position in a sentence normally occupied by any one of the basic units of which the sentence is composed. Cf. sector analysis n. at Compounds 2 below. ΚΠ 1955 E. H. Jorden Syntax Colloq. Japanese v. 13 Evidence furnished by focus-classes indicates that minor sector boundaries should be observed even here—that the IC division should occur between the gerund of the copula and the following verb, where the sector boundary occurs.] 1966 R. L. Allen Verb Syst. Present-day Amer. Eng. iii. 88 An examination of a large number of sequences suggests that in most non-literary sentences there is a kind of ‘spectrum’ of basic positions, which may be called ‘sectors’. 1968 R. Crymes Some Syst. Substitution Correlations in Mod. Amer. Eng. ii. 36 The major positions in the major English sentence, which is a sentence having time orientation ..exist in fixed sequence, and they are called sectors. 1974 Chisholm & Milic Eng. Lang. vii. lii. 424 According to the grammatical description called Sector Analysis, the English sentence consists of ten sectors. II. A scientific instrument. 3. A mathematical instrument, invented by Thomas Hood (see quot. 1598) and improved by Edmund Gunter, used for the mechanical solution of various problems.In its present form it consists of two flat rules stiffly hinged together, inscribed with various kinds of scales. In Hood's form, a graduated arc was an essential part of the instrument, and from some of the inventor's remarks it would appear that the name was given with reference to the form of the apparatus (see sense 1), not, as might be supposed, to its function in performing proportional division of lines. ΘΚΠ the world > relative properties > number > mathematical instruments > [noun] mathematical instrument1588 rectificatory1593 pantometer1597 sector1598 holometer1696 multiplier1875 horn-centre1879 1598 T. Hood Making & Vse of Sector 1 A Sector is a mathematicall instrument consisting of 2. feete, one moueable, an other fixed, making an angle, and of a circumferentall Limbe. 1623 E. Gunter (title) The description and use of the sector, the crosse-staffe, and other instruments. 1673 E. Browne Brief Acct. Trav. Hvngaria 18 By applying an Instrument joynted like a Carpenters Rule, or a Sector, the Skin is held fast. 1766 Compl. Farmer at Surveying If a little error be committed in making up the sector, the most of it goes off again in the substraction of the triangle. 1803 Philos. Trans. (Royal Soc.) 93 387 In the sector I am going to describe, Mr. Ramsden has obviated the inconveniences attendant on the use of former sectors. 1881 F. J. Britten Watch & Clockmakers' Handbk. (ed. 4) 24 The sector is really a proportional measuring gauge, suited for nearly all requirements of the watch and clockmaker. attributive.1694 J. Atkinson Wakely's Mariners-compass Rectified (new ed.) 273 All Sector-Lines or Scales, meet at the center of the Head (where the Joint is) at the left-hand, and from thence are figured towards the right, each being twice repeated; that is, one on each Leg or Side of the Sector answering one another.1694 J. Atkinson Wakely's Mariners-compass Rectified (new ed.) 274 The Use of the Sector-Lines for Projection. 4. An astronomical instrument consisting of a telescope turning about the centre of a graduated arc. See dip-sector n., zenith sector n. ΘΚΠ the world > the universe > cosmology > science of observation > astronomical instruments > observational instruments > [noun] > telescope sector1711 astronomical telescope1723 sweeper1786 comet seeker1819 photo-telescope1893 Schmidt–Cassegrain1943 space telescope1953 photopolarimeter1971 1711 T. Hearne Remarks & Coll. (1889) III. 129 By my Sector it is but 141. 1755 Gentleman's Mag. Nov. 511/1 A sector of six feet radius, whose divided arc was somewhat more than 51 degrees. 1843 Penny Cycl. XXVII. 765/2 Bradley's sector as originally made was not reversible, and therefore only fit for measuring differences or variations. 1877 G. F. Chambers Handbk. Descr. Astron. (ed. 3) 920 Sector, astronomical, an instrument for finding the distance between two objects whose distance is too great to be measured by means of a micrometer in a fixed telescope. Compounds C1. General attributive. sector-like adj. ΚΠ 1899 T. C. Allbutt et al. Syst. Med. VII. 318 Occasionally, instead of complete blindness of one-half of the visual field, sector, or quadrant-like defects are found in the upper or lower half. sector-shaped adj. ΚΠ 1902 Orde-Browne Armour in Encycl. Brit. XXV. 670/2 The joints shown in this figure indicate that the turret roof is built up of fifteen sector-shaped pieces. C2. sector analysis n. Grammar the analysis of sentences in terms of the positions occupied by the basic units of which they are composed (cf. sense 2i above). ΚΠ 1966 R. L. Allen Verb Syst. Present-day Amer. Eng. iii. 88 The order..of the occupied sectors remains constant... Many of the details of this ‘sector’ analysis lie beyond the scope of the present study. 1971 D. T. Bình Tagmemic Comparison Struct. of Eng. & Vietnamese Sentences iii. 66 Sector analysis..primarily emphasizes the positions of units on the sentence, trunk, and predicate..levels. 1977 Amer. Speech 1975 50 127 Only the concluding chapters give any attention to the problems of composition, and much of this is a discussion of sector analysis. sector machine n. (see quot. 1888). ΚΠ 1888 C. T. Jacobi Printers' Vocab. 121 Sector machine, a cylindrical printing machine. sector-piece n. a sector-shaped portion of any object. ΘΚΠ the world > space > shape > other specific shapes > [noun] > sector- or segment-shaped object segment1646 sector1715 sector-piece1715 1715 J. T. Desaguliers tr. N. Gauger Fires Improv'd 122 Fix a couple of Springs under the Frame, each of which must bear against the Limbs of the Sector-Pieces. 1902 Orde-Browne Armour in Encycl. Brit. XXV. 670/2 Before adoption a sector piece was subjected to three blows from projectiles fired from an Elswick 100-ton breech-loading gun. sector scan n. (frequently attributive with hyphen). ΚΠ 1946 Radar: Summary Rep. & Harp Project (U.S. National Defense Res. Comm., Div. 14) 143/2 Sector scan, motion of the scanner reflector back and forth through a limited angle, instead of through 360°. 1969 R. P. Selby in C. J. Richards Mech. Engin. in Radar & Communications ix. 387 Radar installations used for air-traffic control are sometimes required to operate on demand in sector-scan mode, the area of scan usually not exceeding 20° and the rate of scan approximately 20 scans per minute. 1978 Nature 9 Nov. 174/1 A simple sector scan mode is used, at a frequency of 1 Hz, with the target coupled acoustically to the transducer with water. sector scanning n. scanning with radar, sonar, or the like in which the detector rotates to and fro through a fixed angle. ΚΠ 1946 Princ. & Applic. of Underwater Sound (U.S. Nat. Defense Res. Comm.) (1968) xi. 213/1 A plan position indicator is..required for sector scanning, the CRO spot..tracing a synchronous map of the motion of the active region. 1969 R. P. Selby in C. J. Richards Mech. Engin. in Radar & Communications ix. 386 It is sometimes required to move an antenna system about a vertical axis in an oscillatory mode (sector-scanning), thereby turning the antenna through a limited arc in either direction. 1974 Y. Kikuchi in G. W. Stroke et al. Ultrasonic Imaging & Holography 267 Asberg has been proposing a high speed sector scanning of a focusing mirror system receiver for obtaining an ultrasonic cinematogram of the living heart. 1977 Navy News July 18/2 Because the number of wrecks on our continental shelf is so high..modern equipment such as Hydrosearch—the British sector-scanning surveying sonar—is particularly needed. Draft additions 1993 Aeronautics. A route or journey flown non-stop by a commercial airline, often as part of a longer flight schedule. ΘΚΠ society > travel > air or space travel > transport by air > [noun] > regularly timed journey > non-stop journey, part of flight schedule sector1950 1950 Stroud & Mearles in James & Stroud World's Airways ii. 56/1 It was for the operation of the Singapore–Brisbane sector that the D.H.86 was designed. 1961 Observer 12 Feb. 1/5 The pilots claim that the four ‘sectors’ a day allotted to Comet pilots under the summer schedules are ‘too much’. A ‘sector’ is the journey between a take-off and a landing. 1976 Aviation Week 16 Feb. 22/3 For Europe in 1990, the predicted total of 435 billion seat miles offered is expected to be broken down to 250 billion seat miles for long-range routes and 185 billion seat miles on short/medium-range sectors. 1986 Aircraft Illustr. July 374/2 The series 3A-RA and 3B-RA had a range..of 1,770 statute miles, permitting..an unrefuelled sector from London to Istanbul. This entry has not yet been fully updated (first published 1911; most recently modified version published online March 2022). sectorv. Brit. /ˈsɛktə/, U.S. /ˈsɛktər/ Etymology: < sector n. transitive. To divide into sectors; to provide with sectors. ΘΚΠ the world > relative properties > wholeness > mutual relation of parts to whole > separation > action of dividing or divided condition > divide [verb (transitive)] > divide into sectors sector1881 1881 F. J. Britten Watch & Clockmakers' Handbk. (ed. 4) 21 Circularly rounded pinions may be used as driver if they are sectored large. 1902 W. D. Jones in Times 1 Dec. 15/2 It would appear that..the Belle Isle light..is not correctly sectored. This entry has not yet been fully updated (first published 1911; most recently modified version published online March 2022). < n.1570v.1881
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sectorn.

Compounds

Draft additions 1993

sectorv.