- Mate (term) , a term for a friend, especially in the United Kingdom and Australasia; also used to address strangers
- One of a pair of animals, sometimes also applied to a human partner; see Mating
- A deck officer on a Merchant Marine vessel, usually ranked from Third Mate or Third Officer (safety officer) through Second Mate or Second Officer (navigation officer) to First Mate, Chief Mate , First Officer or Chief Officer (head of the deck department and second in command under the ship's Master )
- A sailor on a Navy vessel assigned to assist another, higher ranking one (often an officer or petty officer, e.g. Bosun 's mate)
- Checkmate , a situation in chess
- Team-mate, a player on the same sports team
- Running Mate , a fellow candidate for the same party in one election (e.g. running for US President and Vice President)
- Yerba Mate , a South American herb, as well as the popular caffeinated beverage made from it
- Mahte , or Māte, an epithet meaning "mother" applied to goddesses in Latvian mythology
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