An Etymological Dictionary of Astronomy and Astrophysics
English-French-Persian

1) (Of two more objects) to correspond in area and outline; to occupy the same place.
2) To happen at the same time.

Coincide, from Fr. coincider, from M.L. coincidere, from L. → co- "together" + incidere "to fall upon," from in- "upon" + cadere "to fall," PIE base *kad- "to fall".

Barhamoftâdan, from bar- "to, upon, together" + oftâdan "to fall," Mid.Pers. patet "falls," opastan "to fall," Av. pat- " to fly, fall, rush," cf. Skt. patati "he flies, falls," L. petere "to fall, rush out," Gk. piptein "to fall," petomai "I fly," PIE base *pet- "to fly, to rush."

1) Fact, event, or condition of coinciding.
2) The occurrence of events simultaneously in a striking manner but without any causal connexion between them.

→ coincide.

Occupying the same area in space or happening at the same time. Of two geometric figures, matching point for point.

From Fr. coincident, from M.L. coincident-, coincidens, pr.p. of coincidere, → coincide.

→ coincide.