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coherence

[koh-heer-uh ns, -her-] /koʊˈhɪər əns, -ˈhɛr-/
noun
1.
the act or state of cohering; cohesion.
2.
logical interconnection; overall sense or understandability.
3.
congruity; consistency.
4.
Physics, Optics. (of waves) the state of being coherent.
5.
Linguistics. the property of unity in a written text or a segment of spoken discourse that stems from the links among its underlying ideas and from the logical organization and development of its thematic content.
Compare cohesion (def 4).
Also, coherency.
Origin
1570-1580
1570-80; coher(ent) + -ence
Related forms
noncoherence, noun
noncoherency, noun
Synonyms
3. correspondence, harmony, agreement, rationality.
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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British Dictionary definitions for non-coherency

coherence

/kəʊˈhɪərəns/
noun
1.
logical or natural connection or consistency
2.
another word for cohesion (sense 1)
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition
© William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012
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Word Origin and History for non-coherency

coherence

n.

late 16c., from Middle French cohérence (16c.), from Latin cohaerentia, noun of state from cohaerentem (see coherent). Related: Coherency.

Online Etymology Dictionary, © 2010 Douglas Harper
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non-coherency in Science
coherence
  (kō-hîr'əns, -hěr'-)   
A property holding for two or more waves or fields when each individual wave or field is in phase with every other one. Lasers, for example, emit almost perfectly coherent light; all the photons emitted by a laser have the same frequency and are in phase. Since quantum states can be described by a wave equation, coherence can hold for quantum states in general, though only among bosons. Coherence is generally possible in physical systems that may undergo superposition. Maintaining coherence of light is important in fiber optic communications. See also Bose-Einstein condensate.
The American Heritage® Science Dictionary
Copyright © 2002. Published by Houghton Mifflin. All rights reserved.
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Encyclopedia Article for non-coherency

coherence

a fixed relationship between the phase of waves in a beam of radiation of a single frequency. Two beams of light are coherent when the phase difference between their waves is constant; they are noncoherent if there is a random or changing phase relationship. Stable interference patterns are formed only by radiation emitted by coherent sources, ordinarily produced by splitting a single beam into two or more beams. A laser, unlike an incandescent source, produces a beam in which all the components bear a fixed relationship to each other

Learn more about coherence with a free trial on Britannica.com
Encyclopedia Britannica, 2008. Encyclopedia Britannica Online.
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