n. One who accompanies or associates with another, either habitually or casually; one who shares the lot of another; a mate; a comrade.n. A fellow; a worthless person.n. One who holds the lowest rank in an English honorary order: as, a companion of the Bath (abbreviated C. B.), St. Michael and St. George, etc.To be a companion to; accompany.To make equal; put on the same level.n. Nautical: The framing and sash-lights on the quarter-deck or round-house, through which light passes to the cabins and deck below.n. A raised hatch or cover to the cabin-stair of a merchant vessel.To associate or keep company: used with with: as, to companion with vagabonds.A simplified spelling of companion.