[koh-heer-uhnt, -her-]
logically connected; consistent: a coherent argument.
cohering; sticking together: a coherent mass of sticky candies.
having a natural or due agreement of parts; harmonious: a coherent design.
Physics, Optics. of or pertaining to waves that maintain a fixed phase relationship, as in coherent light.
Compare laser.

1570–80; < Medieval Latin cohērent-, variant of Latin cohaerent- (stem of cohaerēns), present participle of cohaerēre. See cohere, -ent

coherently, adverb
noncoherent, adjective
noncoherently, adverb Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
coherent (kəʊˈhɪərənt)
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

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009
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Word Origin & History

1550s, from M.Fr. cohérent, from L. cohærentem (nom. cohærens), prp. of cohærere "cohere," from com- "together" + hærere "to stick" (see hesitation).
Online Etymology Dictionary, © 2010 Douglas Harper
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Example sentences
These devices create coherent green light in a three step process.
And whereas many measures of depression and sadness have been defined, a
  coherent description of happiness remains elusive.
There is no non-mathematical vocabulary available which is going to be
  internally consistent and coherent in a quantum context.
It could, with the caveat that the transmitter and receiver need to remain
  coherent with each other.
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