The quality of being oppositive.

plural of oppositive

People who are completely different make ideal partners.

plural of polar opposite

(fencing) The deflection of the incoming attack without ever losing contact with the blade from the initial engagement.

A recognized political party or group of parties in multiparty political systems that is present in Parliament or some other legislative body and does not control the floor (usually due to being in the minority).

(childish) A contrived holiday on which everything is done backwards, for example "yes" means "no".

(politics) Negative information retrieved about a candidate's opponent in an election for use in campaigning.

(idiomatic) A person who holds a position in an organization that corresponds to that held by another person in another organization; a counterpart

A side, party (e.g. a team or armed force) seen as adversary, enemy etc. opposite one (or more) other(s), as in a battle or team sports competition.