| 释义 |
coherent, a. (and n.)|kəʊˈhɪərənt|
Also 8 cohær-.
[a. F. cohérent, ad. L. cohærēnt-em, pr. pple. of cohærēre to cohere.]
A. adj.
1. a. That sticks or clings firmly together; esp. united by the force of cohesion. Const. to, with. Said of a substance, material, or mass, as well as of separate parts, atoms, etc.
1578Banister Hist. Man i. 29 The thyrd [bone of the wrest], is with the second coherent. 1626Bacon Sylva §298 Most Powders grow more close and coherent by mixture of Water, than by mixture of Oyl. 1709Blair in Phil. Trans. XXVII. 85 The Fasciculi were more strictly coherent to one another. 1869Roscoe Elem. Chem. 221 The metal barium has not yet been obtained in the coherent state. 1878Huxley Physiogr. 21 These rocks are sufficiently coherent to form durable building stones.
b. spec. in Bot.: United by cohesion, q.v.
1830Lindley Nat. Syst. Bot. 171 Seed without its proper integuments, its testa being coherent with the utricle. 1872Oliver Elem. Bot. i. iv. 37 Primrose: the sepals coherent.
†c. coherent small-pox (see quot.). Obs.
1722Jurin Small Pox in Phil. Trans. XXXII. 191 Small Pox, of that sort which is call'd the cohærent, or the middle between the distinct and the confluent kind.
d. Various spec. senses in Physics (see quots.).
1902Mann & Millikan tr. Drude's Theory of Optics 134 If two sources are to produce interference, their phases must always be either exactly the same or else have a constant difference. Such sources are called coherent. 1937Frank & Tamm in Compt. Rend. Acad. Sci. URSS XIV. 109 (heading) Coherent visible radiation of fast electrons passing through matter. 1938Physical Rev. LIV. 500/2 The theory [of Frank and Tamm] implies that the radiation emitted by the electron along its path is coherent. 1939I. Tamm in Jrnl. Physics USSR I. 454 The experimental investigation of the Cerenkov radiation is made possible..by the fact that in the visible region the intensity of the coherent radiation is much greater than that of the Bremsstrahlung. 1957Gloss. Terms Nucl. Sci. (Nat. Res. Council, U.S.) 151/2 Scattering of particles or photons in which there are definite phase relationships between the incoming and the scattered waves, is termed coherent scattering. 1958Chambers's Techn. Dict. 967/2 Coherent oscillator, one which is stabilised by being locked to the transmitter of a radar set for beating with a reflected incoming pulse signal. 1960Cooke & Markus Electronics & Nucleonics Dict., Coherent radiation, radiation in which there are definite phase relationships between different points in a cross-section of the beam... Interference bands are observed only between coherent beams. 1961Ann. Reg. 1960 xi. 396 This light was different from that in the flash since the tripping action of the first light to be produced ensured that all subsequent quanta were produced with light waves in synchronism with it. In other words, the light produced from the laser was ‘coherent’. 1963Standard News Mar. 58/1 The action of a laser is to emit light of very narrow bandwidth and considerable intensity—what is called coherent light. 1965New Scientist 16 Sept. 676/2 A far simpler data-processing system results from the use of coherent light.
2. transf. of non-material cohesion.
1655–60Stanley Hist. Philos. (1701) 184/2 If there are intelligibles, and those neither sensibles, nor coherent with sensibles. 1660Boyle Seraphic Love 104 Controversies..about Prædestination, and the coherent doctrines. a1677Barrow Serm. Wks. 1716 I. 225 Coherent with this is a Third property of..love. a1718Penn Tracts Wks. 1726 I. 594 Most times Points are to be prov'd by comparing and weighing Places coherent. 1855H. Spencer Princ. Psychol. (1872) I. ii. ii. 178 Among the successive auditory feelings there are definite and coherent combinations of groups. 1876J. H. Newman Hist. Sk. I. i. iii. 149 An empire, more stable, more coherent than any Turkish rule before it.
†3. Accordant or related logically or in sense; congruent; harmoniously accordant. Obs.
c1555Harpsfield Divorce Hen. VIII (1878) 39 These places are nothing coherent to the state of our present question. 1593Bilson Govt. Christ's Ch. 100 As most coherent with the Text. 1601Shakes. All's Well iii. vii. 39 That time and place with this deceite so lawfull May proue coherent.
4. a. Of thought, speech, reasoning, etc.: Of which all the parts are consistent, and hang well together.
1580North Plutarch (1676) 991 A Speech not coherent and hanging well together. 1678Cudworth Intell. Syst. 879 Good Coherent Sense. a1714Burnet Own Time (1766) I. 438 The story is so coherent. 1869Freeman Norm. Conq. (1876) III. xii. 230 The Norman accounts are anything but satisfactory or coherent.
b. said of persons.
1724Watts Logic iii. iv. §1 A coherent thinker, and a strict reasoner, is not to be made at once by a set of rules. 1848Dickens Dombey 51 Be plain and coherent, if you please.
†B. n.
a. One who coheres or combines with others.
b. That which coheres or is connected. (In quot. 1657, ‘context’; = coherence 5.) Obs.
1598Florio, Complice, a partaker, a complice, a confederate, a coherent. 1617Markham Caval. viii. 17 A world of such deceits, which doe depend and are coherents to his former mischiefes. 1657Burton's Diary (1828) II. 306 [He] moved, that the coherents might be read, to explain it. |