#1 pair n. [brace] a set of two similar things considered as a unit. wn
#2 pair n. [couple, twosome, twain, brace, span, yoke, couplet, distich, duo, duet, dyad, duad] two items of the same kind. wn
#3 pair n. two people considered as a unit. wn
#4 pair v. [pair off, partner off, couple] form a pair or pairs; "The two old friends paired off". wn
#5 pair v. [match, mate, couple, twin] bring two objects, ideas, or people together; "This fact is coupled to the other one"; "Matchmaker, can you match my daughter with a nice young man?"; "The student was paired with a partner for collaboration on the project". wn
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