1. [adj]  (grammar) syntactically establishing a relationship of contrast between sentences or elements of a sentence; "disjunctive conjunctions like `but', `or', or `though' serve a contrastive function"
2. [adj]  strikingly different; tending to contrast; "contrasting (or contrastive) colors"
3. [adj]  of words so related that one contrasts with the other; "`rich' and `hard-up' are contrastive terms"

CONTRASTIVE is a 11 letter word that starts with C.