One who accompanies or is in company with another for a longer or shorter period, either from choice or casually; one who is much in the company of, or is associated with, another or others; an associate; a comrade; a consort; a partner.
- A person who accompanies or associates with another; a comrade.
- A domestic partner.
- A person employed to assist, live with, or travel with another.
- One of a pair or set of things; a mate.
- To be a companion to; accompany.
- Nautical A companionway.