Coherent

google

ref

mid 16th century (in the sense ‘logically related to’): from Latin cohaerent- ‘sticking together’, from the verb cohaerere (see cohere).

wiktionary

ref

From Middle French coherent, from Latin cohaērēns, from co- + haereō.

etymonline

ref

coherent (adj.)

1550s, "harmonious;" 1570s, "sticking together," also "connected, consistent" (of speech, thought, etc.), from 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).