Source : Webster's Revised Unabridged Dictionary (1913)

Coincident \Co*in"ci*dent\, a. [Cf. F. co["i]ncident.]
   Having coincidence; occupying the same place;
   contemporaneous; concurrent; -- followed by with.

         Christianity teaches nothing but what is perfectly
         suitable to, and coincident with, the ruling principles
         of a virtuous and well-inclined man.     --South.

Coincident \Co*in"ci*dent\, n.
   One of two or more coincident events; a coincidence. [R.]
   ``Coincidents and accidents.'' --Froude.

Source : WordNet®

coincident
     adj 1: occurring or operating at the same time; "a series of
            coincident events" [syn: {coincidental}, {coinciding},
             {concurrent}, {cooccurring}, {simultaneous}]
     2: matching point for point; "coincident circles" [syn: {coinciding}]