One who is associated with another or others as a principal or the contributor of capital in a business or joint adventure, and usually shares its risks and profits. See partnership, One who has a part in anything with an other; a partaker; an associate; a sharer, a person's partner in marriage, verb_ act as a partner, provide with a partner, to work or perform as a partner, intransitive verb_ To become partners or work or associate as partners, To be or make a partner of