To be or become a mate or mates, especially in sexual companionship; as, some birds mate for life; this bird will not mate with that one.

the partner of an animal (especially a sexual partner); "he loved the mare and all her mates"; "camels hate leaving their mates"

a person's partner in marriage

make love; "Birds mate in the Spring"

A term used to describe one's committed sexual, romantic, or "life" partner.