| verb | form a pair or pairs “The two old friends paired off” |
| verb | bring two objects, ideas, or people together “This fact is coupled to the other one” |
| verb | occur in pairs |
| verb | arrange in pairs “Pair these numbers” |
| verb | engage in sexual intercourse “Birds mate in the Spring” |
| adjective | used of gloves, socks, etc. |
| adjective | of leaves etc; growing in pairs on either side of a stem “opposite leaves” |
| adjective | mated sexually |
| pair | noun | two people considered as a unit |
| pairing | noun | the act of grouping things or people in pairs |
| couple | noun | a pair who associate with one another |
| match | noun | a pair of people who live together |
| mate | noun | an exact duplicate |
| coupling | noun | a connection (like a clamp or vise) between two things so they move together |
| copulatory | adjective | of or relating to coitus or copulation |
| copulation | noun | the act of sexual procreation between a man and a woman; the man's penis is inserted into the woman's vagina and excited until orgasm and ejaculation occur |
| mating | noun | the act of pairing a male and female for reproductive purposes |