Definition of companion

• n. - 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.
• n. - A knight of the lowest rank in certain orders; as, a companion of the Bath.
• n. - A fellow; -- in contempt.
• n. - A skylight on an upper deck with frames and sashes of various shapes, to admit light to a cabin or lower deck.
• n. - A wooden hood or penthouse covering the companion way; a companion hatch.
• v. t. - To be a companion to; to attend on; to accompany.
• v. t. - To qualify as a companion; to make equal.