[koh-heer-uhns, -her-]
the act or state of cohering; cohesion.
logical interconnection; overall sense or understandability.
congruity; consistency.
Physics, Optics. (of waves) the state of being coherent.
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.

1570–80; coher(ent) + -ence

noncoherence, noun
noncoherency, noun

3. correspondence, harmony, agreement, rationality. Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
coherence or coherency (kəʊˈhɪərəns, kəʊˈhɪərənsɪ)
1.  logical or natural connection or consistency
2.  another word for cohesion
coherency or coherency

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

c.1580, from cohérence (16c.), from L. cohærentia, noun of state from cohærentem (see coherent).
Online Etymology Dictionary, © 2010 Douglas Harper
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American Heritage
Science Dictionary
coherence   (kō-hîr'əns, -hěr'-)  Pronunciation Key 
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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Example sentences
Theory by its nature is about coherency and precision, it sacrifices accuracy
  to these goals.
Newt is not one known for contingency and coherency, and that's a problem.
Coherency allows synchronization and cooperative use of shared resources.
By explaining how teacher and immediacy and power function, implicit
  communication theory offers increased conceptual coherency.
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