A petty officer assisting the boatswain aboard ship.

(chess) A checkmate pattern in which the king is confined to two squares at an edge of the board and then mated by two doubled rooks.

(chess) A checkmate delivered by a pawn.

(chess) A checkmate delivered by a major piece along the back rank against a king whose advancement is prevented by pieces of its own color (most commonly pawns).

(Britain, slang) An individual who has few or no friends.

plural of office mate

plural of first mate

plural of team-mate

(psychology, genetics) Between males and females of a species, the mutual attraction or selection, for reproductive purposes, of individuals with similar characteristics.

plural of soul mate