The Collaborative International Dictionary of English v.0.48:
Coincide \Co`in*cide"\, v. i. [imp. & p. p. Coincided; p. pr.
& vb. n. Coinciding.] [L. co- + incidere to fall on; in +
cadere to fall: cf. F. co["i]ncider. See Chance, n.]
1. To occupy the same place in space, as two equal triangles,
when placed one on the other.
If the equator and the ecliptic had coincided, it
would have rendered the annual revoluton of the
earth useless. --Cheyne.
2. To occur at the same time; to be contemporaneous; as, the
fall of Granada coincided with the discovery of America.
3. To correspond exactly; to agree; to concur; as, our aims
The rules of right jugdment and of good
ratiocination often coincide with each other.