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A fellow, comrade, colleague, partner or someone with whom something is shared, e.g. shipmate, classmate.
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(especially of a non-human animal) A breeding partner.
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(colloquial, British, Australia, New Zealand, Ireland, South Africa, sometimes elsewhere in the Commonwealth) A friend, usually of the same sex.
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(colloquial, British, Australia, New Zealand, Ireland, South Africa, sometimes elsewhere in the Commonwealth) Friendly term of address to a stranger, usually male, of similar age.
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(nautical) 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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(nautical) A ship's officer, subordinate to the master on a commercial ship.
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(nautical) A first mate.
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A technical assistant in certain trades (e.g. gasfitter's mate, plumber's mate); sometimes an apprentice.
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The other member of a matched pair of objects.
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A suitable companion; a match; an equal.