n.
- a person who takes part in an undertaking with another or others, especially in a business or firm with shared risks and profits.
- either of two people doing something as a couple or pair.
- either member of a married couple or of an established unmarried couple.
- US dated or dialect a friendly form of address by one man to another.
v.
- be the partner of.
- N. Amer. associate as partners.
Derivative
Etymology
ME: alt. of parcener ‘partner, joint heir’, from Anglo-Norman Fr. parcener, based on L. partitio(n-) ‘partition’.