partner

partner is a Noun

Definition:

[1] One who has a part in anything with an other; a partaker; an associate; a sharer. "Partner of his fortune." Shak. Hence: (a) A husband or a wife. (b) Either one of a couple who dance together. (c) One who shares as a member of a partnership in the management, or in the gains and losses, of a business. My other self, the partner of my life. Milton.

[2] An associate in any business or occupation; a member of a partnership. See Partnership.

[3] A framework of heavy timber surrounding an opening in a deck, to strengthen it for the support of a mast, pump, capstan, or the like. Dormant, or Silent, partner. See under Dormant, a.