Coincide
early 18th century (in the sense ‘occupy the same space’): from medieval Latin coincidere, from co- ‘together with’ + incidere ‘fall upon or into’.
wiktionary
From French coïncider, from Medieval Latin coincidere, present active infinitive of coincidō, from co- + incidō, from in- + cadō.
etymonline
coincide (v.)
1705, "be identical in substance or nature;" 1715, "occupy the same space, agree in position," from Medieval Latin coincidere (used in astrology), literally "to fall upon together," from assimilated form of Latin com "with, together" (see com-) + incidere "to fall upon" (from in- "upon" + combining form of cadere "to fall," from PIE root *kad- "to fall"). From 1809 as "occur at the same time." Related: Coincided; coinciding. Latin coincidere was used as a verb in English from 1640s.
