Contraposit is a logical term that refers to the inverse and the negation of a proposition. Synonyms for this word include inverse, converse, reciprocal, and opposite. The inverse is the counterpart of a proposition wherein the subject and predicate swap places and then negate. The converse is another term for an inverse in which the subject and predicate change position without negation. The reciprocal, on the other hand, pertains to reciprocal propositions that have interchanged subject and predicate terms. Finally, the opposite refers to a proposition that is contradictory to another. These synonyms for contraposit are useful in logic and mathematics to build arguments and proofs.