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coherent

[koh-heer-uh nt, -her-] /koʊˈhɪər ənt, -ˈhɛr-/
adjective
1.
logically connected; consistent:
a coherent argument.
2.
having a natural or due agreement of parts; harmonious:
a coherent design.
3.
cohering; sticking together:
a coherent mass of sticky candies.
4.
Physics, Optics. of or relating to waves that maintain a fixed phase relationship, as in coherent light, or light in which the electromagnetic waves maintain a fixed and predictable phase relationship with each other over a period of time.
See also laser.
Origin of coherent
1570-1580
1570-80; < Medieval Latin cohērent-, variant of Latin cohaerent- (stem of cohaerēns), present participle of cohaerēre. See cohere, -ent
Related forms
coherently, adverb
noncoherent, adjective
noncoherently, adverb
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Based on the Random House Dictionary, © Random House, Inc. 2015.
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British Dictionary definitions for coherent

coherent

/kəʊˈhɪərənt/
adjective
1.
capable of logical and consistent speech, thought, etc
2.
logical; consistent and orderly
3.
cohering or sticking together
4.
(physics) (of two or more waves) having the same phase or a fixed phase difference: coherent light
5.
(of a system of units) consisting only of units the quotient or product of any two of which yield the unit of the resultant quantity
Derived Forms
coherently, adverb
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition
© William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
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Word Origin and History for coherent
adj.

1550s, from Middle French cohérent (16c.), from Latin cohaerentem (nominative cohaerens), present participle of cohaerere "cohere," from com- "together" (see co-) + haerere "to stick" (see hesitation).

Online Etymology Dictionary, © 2010 Douglas Harper
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