1550s, "harmonious;" 1570s, "sticking together," also "connected, consistent" (of speech, thought, etc.), from Middle French cohérent (16c.), from Latin cohaerentem (nominative cohaerens), present participle of cohaerere "cohere," from assimilated form of com "together" (see co-) + haerere "to adhere, stick" (see hesitation).
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