Etymology
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coherence (n.)

1580s, "suitable connection or dependence, consistency" (in narrative or argument), also more literally "act or state of sticking or cleaving of one thing to another," from French cohérence (16c.), from Latin cohaerentia, abstract noun from cohaerentem(nominative cohaerens), present participle of cohaerere "to stick together, be coherent," from assimilated form of com "together" (see co-) + haerere "to adhere, stick" (see hesitation). Related: Coherency.

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Definitions of coherence

coherence (n.)
the state of cohering or sticking together;
Synonyms: coherency / cohesion / cohesiveness
coherence (n.)
logical and orderly and consistent relation of parts;
Synonyms: coherency
From wordnet.princeton.edu