coincident

Short definition from Wiktionary

Adjective

1. 1
   Of two or more objects: being in the same location.
2. 2
   Of two or more events: occurring at the same time; contemporaneous.
3. 3
   Of two or more things: having the same qualities; being in accordance; consonant, matching.
4. 4
   Chiefly followed by to: accompanying, concomitant, incident.

Noun

1. 1
   One of multiple incidents or things which coincide with each other; a concomitant.