coherent

[koh-heer-uh nt, -her-]
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

1570–80; < Medieval Latin cohērent-, variant of Latin cohaerent- (stem of cohaerēns), present participle of cohaerēre. See cohere, -ent
Related formsco·her·ent·ly, adverbnon·co·her·ent, adjectivenon·co·her·ent·ly, adverb
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018

British Dictionary definitions for non-coherent

coherent

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 differencecoherent 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 Formscoherently, adverb
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

Word Origin and History for non-coherent

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