Possible Definitions:
1. Partner (n.) 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.
2. Partner (n.) An associate in any business or occupation; a member of a partnership. See Partnership.
3. Partner (n.) 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.
4. Partner (v. t.) To associate, to join.
