definition
A fellow, comrade, colleague, partner or someone with whom something is shared, e.g. shipmate, classmate.
definition
(especially of a non-human animal) A breeding partner.
definition
A friend, usually of the same sex.
example
He's my best mate.
definition
Friendly term of address to a stranger, usually male, of similar age
example
Excuse me, mate, have you got the time?
definition
In naval ranks, a non-commissioned officer or his subordinate (e.g. Boatswain's Mate, Gunner's Mate, Sailmaker's Mate, etc).
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A ship's officer, subordinate to the master on a commercial ship.
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A first mate.
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A technical assistant in certain trades (e.g. gasfitter's mate, plumber's mate); sometimes an apprentice.
definition
The other member of a matched pair of objects.
example
I found one of the socks I wanted to wear, but I couldn't find its mate.
definition
A suitable companion; a match; an equal.