Definitions from Wiktionary ( )

▸ noun:  Two similar or identical things taken together; often followed by of.
▸ noun:  One of the constituent items that make up a pair.
▸ noun:  Two people in a relationship, partnership or friendship.
▸ noun:  Used with binary nouns (often in the plural to indicate multiple instances, since such nouns are plural only, except in some technical contexts)
▸ noun:  A couple of working animals attached to work together, as by a yoke.
▸ noun:  (card games) A poker hand that contains two cards of identical rank, which cannot also count as a better hand.
▸ noun:  (cricket) A score of zero runs (a duck) in both innings of a two-innings match.
▸ noun:  (baseball, informal) A double play, two outs recorded in one play.
▸ noun:  (baseball, informal) A doubleheader, two games played on the same day between the same teams
▸ noun:  (rowing) A boat for two sweep rowers.
▸ noun:  (slang) A pair of breasts
▸ noun:  (slang) A pair of testicles
▸ noun:  (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.
▸ noun:  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.
▸ noun:  (archaic) A number of things resembling one another, or belonging together; a set.
▸ noun:  (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.
▸ verb:  (transitive) To group into one or more sets of two.
▸ verb:  (computing) to link two electronic devices wirelessly together, especially through a protocol such as Bluetooth
▸ verb:  (transitive) To bring two (animals, notably dogs) together for mating.
▸ verb:  (intransitive) To come together for mating.
▸ verb:  (politics, slang) To engage (oneself) with another of opposite opinions not to vote on a particular question or class of questions.
▸ verb:  (intransitive) To suit; to fit, as a counterpart.
▸ verb:  (obsolete, transitive) To impair, to make worse.
▸ verb:  (obsolete, intransitive) To become worse, to deteriorate.
▸ noun:  A surname.

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