co|in|ci|den|tal «koh IHN suh DEHN tuhl», adjective.
1. showing coincidence; occurring by chance: »
I have myself…noted a considerable number of very striking coincidental dreams (Notes and Queries).
2. = coincident. (Cf. ↑coincident)
–co|in´ci|den´tal|ly, adverb.
Useful english dictionary. 2012.