A sex partner with whom one has sex, usually repeatedly, but without any romantic attachment (no strings attached).
A spouse or other person with whom one shares a domestic, romantic or sexual bond.
Someone with whom one plays on the same side in a game, such as card games or doubles tennis.
Someone with whom one dances in a two-person dance.
One of the pieces of wood comprising the framework which strengthens the deck of a wooden ship around the holes through which the mast and other fittings pass.
One of each halves of a pair of someone or something that belongs together.
A group financial arrangement in which each member contributes a set amount of money over a set period.
A member of a business or law partnership.
To join as a partner.
To work or perform as a partner.