Pair  —n. 1 set of two people or things used together or regarded as a unit. 2 article (e.g. Scissors, trousers, or pyjamas) consisting of two joined or corresponding parts. 3 a engaged or married couple. B mated couple of animals. 4 two horses harnessed side by side (coach and pair). 5 member of a pair in relation to the other (cannot find its pair). 6 two playing-cards of the same denomination. 7 either or both of two mps etc. On opposite sides agreeing not to vote on certain occasions. —v. 1 (often foll. By off) arrange or be arranged in couples. 2 a join or be joined in marriage. B (of animals) mate. [latin paria: related to *par]