From WordNet (r) 3.0 (2006):
pair
n 1: a set of two similar things considered as a unit [syn:
pair, brace]
2: two items of the same kind [syn: couple, pair, twosome,
twain, brace, span, yoke, couplet, distich,
duo, duet, dyad, duad]
3: two people considered as a unit
4: a poker hand with 2 cards of the same value
v 1: form a pair or pairs; "The two old friends paired off"
[syn: pair, pair off, partner off, couple]
2: 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" [syn:
match, mate, couple, pair, twin]
3: occur in pairs [syn: pair, geminate]
4: arrange in pairs; "Pair these numbers" [syn: pair,
geminate]
5: engage in sexual intercourse; "Birds mate in the Spring"
[syn: copulate, mate, pair, couple]