- (archaic) A number of things resembling one another, or belonging together; a set.
- Two people in a relationship, partnership (especially sexual) or friendship.
"Spouses should make a great pair."
- (card games) A poker hand that contains of two cards of identical rank, which cannot also count as a better hand.
- (baseball, informal) A doubleheader, two games played on the same day between the same teams
"The Pirates took a pair from the Phillies."
- Two members of opposite parties or opinion, as in a parliamentary body, who mutually agree not to vote on a given question, or on issues of a party nature during a specified time.
"There were two pairs on the final vote."
- Two similar or identical things taken together; often followed by of.
"I couldn't decide which of the pair of designer shirts I preferred, so I bought the pair."
- A couple of working animals attached to work together, as by a yoke.
"A pair is harder to drive than two mounts with separate riders."
- (baseball, informal) A double play, two outs recorded in one play
"They turned a pair to end the fifth."
- (Australia, politics) The exclusion of one member of a parliamentary party from a vote, if a member of the other party is absent for important personal reasons.
- (kinematics) In a mechanism, two elements, or bodies, which are so applied to each other as to mutually constrain relative motion; named in accordance with the motion it permits, as in turning pair, sliding pair, twisting pair.
- Used with binary nouns (often in the plural to indicate multiple instances, since such nouns are plurale tantum)
"a pair of scissors; two pairs of spectacles; several pairs of jeans"
- (cricket) A score of zero runs (a duck) in both innings of a two-innings match
- (slang) A pair of breasts
"She's got a gorgeous pair."
- (transitive) To bring two (animals, notably dogs) together for mating.
- (computing) to form wireless connection between to devices
- (transitive) To group into sets of two.
"The wedding guests were paired boy/girl and groom's party/bride's party."
- (intransitive) To suit; to fit, as a counterpart.
- (politics, slang) To engage (oneself) with another of opposite opinions not to vote on a particular question or class of questions.
- (obsolete) To impair.