orientableadj.

Brit.

/ˈɔːrɪəntəbl/,

/ˈɒrɪəntəbl/,

/ˌɔːrɪˈɛntəbl/,

/ˌɒrɪˈɛntəbl/, U.S.

/ˈɔriən(t)əb(ə)l/,

/ˌɔriˈɛn(t)əb(ə)l/

Origin: Formed within English, by derivation. Etymons: orient v., -able suffix.

Etymology: < orient v. + -able suffix. Compare French orientable (1918 in general sense), German orientierbar (1920 in mathematical sense).

1. Capable of being oriented (in various senses).

ΘΚΠ

the world > space > direction > [adjective] > turning or able to face any direction

turnable1483

convertible1526

versable1623

various1629

versatile1658

tropic1677

orientable1912

1912 Times 30 Oct. 22/4 The orientable tail skid arrangement..provides an independent land rudder.

1935 A. P. Herbert What a Word! iii. 85 One of our great motor-manufacturers advertises ‘A very neat orientable anti-glare visor’.

1960 L. Picken Organization of Cells vii. 265 Cleveland's material suggests only that in hypermastigine flagellates the centrioles utilize all orientable material.

1982 Aviation Week & Space Technol. (Nexis) 29 Nov. 84 The ship system contains six firing tubes mounted on an orientable turret.

2003 Millimeter (Nexis) 1 Nov. 11 The camera could tilt straight up while the orientable viewfinder 35 years ahead of its time remained in a fixed position.

2. Mathematics. Of a surface: such that an oriented figure, when moved around any closed path in the surface, returns to its initial position with the same orientation; not non-orientable; (more widely, of a manifold) capable of being assigned a well-defined global coordinate system.

ΘΚΠ

the world > relative properties > number > geometry > surface > [adjective]

monoid1863

anallagmatic1869

scrolar1869

torsal1869

closed1882

vicinal1895

orientable1920

non-orientable1925

1920 Bull. Amer. Math. Soc. 26 371 The manifold is said to be orientable if senses can be assigned to all the tetrahedral regions in such a way as to be consistent at every face.

1921 Ann. Math. 23 146 It is obvious that the manifold represented by the polygon is orientable or two-sided.

1949 S. Lefschetz Introd. Topol. ii. 82 Two orientable connected closed surfaces are homeomorphic if they have the same genus.

1952 P. Nemenyi tr. D. Hilbert & S. Cohn-Vossen Geom. & Imagination vi. 306 It can be demonstrated that all two-sided surfaces are orientable.

1968 A. H. Wallace Differential Topol. vi. 79 The sphere is orientable but the projective plane is not.

1975 W. M. Boothby Introd. Differentiable Manifolds v. 215 A manifold M is orientable if and only if it has a covering..of coherently oriented coordinate neighborhoods.

1990 Q. Jrnl. Math. 41 49 If H has orientable quotient space then the directions of period cycles are determined by adjusting the presentation obtained in [8] to satisfy (γ).

This entry has been updated (OED Third Edition, September 2004; most recently modified version published online March 2022).

单词	orientable
释义	orientableadj. Brit. /ˈɔːrɪəntəbl/, /ˈɒrɪəntəbl/, /ˌɔːrɪˈɛntəbl/, /ˌɒrɪˈɛntəbl/, U.S. /ˈɔriən(t)əb(ə)l/, /ˌɔriˈɛn(t)əb(ə)l/ Origin: Formed within English, by derivation. Etymons: orient v., -able suffix. Etymology: < orient v. + -able suffix. Compare French orientable (1918 in general sense), German orientierbar (1920 in mathematical sense). 1. Capable of being oriented (in various senses). ΘΚΠ the world > space > direction > [adjective] > turning or able to face any direction turnable1483 convertible1526 versable1623 various1629 versatile1658 tropic1677 orientable1912 1912 Times 30 Oct. 22/4 The orientable tail skid arrangement..provides an independent land rudder. 1935 A. P. Herbert What a Word! iii. 85 One of our great motor-manufacturers advertises ‘A very neat orientable anti-glare visor’. 1960 L. Picken Organization of Cells vii. 265 Cleveland's material suggests only that in hypermastigine flagellates the centrioles utilize all orientable material. 1982 Aviation Week & Space Technol. (Nexis) 29 Nov. 84 The ship system contains six firing tubes mounted on an orientable turret. 2003 Millimeter (Nexis) 1 Nov. 11 The camera could tilt straight up while the orientable viewfinder 35 years ahead of its time remained in a fixed position. 2. Mathematics. Of a surface: such that an oriented figure, when moved around any closed path in the surface, returns to its initial position with the same orientation; not non-orientable; (more widely, of a manifold) capable of being assigned a well-defined global coordinate system. ΘΚΠ the world > relative properties > number > geometry > surface > [adjective] monoid1863 anallagmatic1869 scrolar1869 torsal1869 closed1882 vicinal1895 orientable1920 non-orientable1925 1920 Bull. Amer. Math. Soc. 26 371 The manifold is said to be orientable if senses can be assigned to all the tetrahedral regions in such a way as to be consistent at every face. 1921 Ann. Math. 23 146 It is obvious that the manifold represented by the polygon is orientable or two-sided. 1949 S. Lefschetz Introd. Topol. ii. 82 Two orientable connected closed surfaces are homeomorphic if they have the same genus. 1952 P. Nemenyi tr. D. Hilbert & S. Cohn-Vossen Geom. & Imagination vi. 306 It can be demonstrated that all two-sided surfaces are orientable. 1968 A. H. Wallace Differential Topol. vi. 79 The sphere is orientable but the projective plane is not. 1975 W. M. Boothby Introd. Differentiable Manifolds v. 215 A manifold M is orientable if and only if it has a covering..of coherently oriented coordinate neighborhoods. 1990 Q. Jrnl. Math. 41 49 If H has orientable quotient space then the directions of period cycles are determined by adjusting the presentation obtained in [8] to satisfy (γ). This entry has been updated (OED Third Edition, September 2004; most recently modified version published online March 2022). < adj.1912
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