companion

American Heritage® Dictionary of the English Language, Fourth Edition

1. n. A person who accompanies or associates with another; a comrade.
2. n. A domestic partner.
3. n. A person employed to assist, live with, or travel with another.
4. n. One of a pair or set of things; a mate.
5. v. To be a companion to; accompany.
6. n. Nautical A companionway.

Century Dictionary and Cyclopedia

1. n. One who accompanies or associates with another, either habitually or casually; one who shares the lot of another; a mate; a comrade.
2. n. A fellow; a worthless person.
3. 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.
4. To be a companion to; accompany.
5. To make equal; put on the same level.
6. n. Nautical: The framing and sash-lights on the quarter-deck or round-house, through which light passes to the cabins and deck below.
7. n. A raised hatch or cover to the cabin-stair of a merchant vessel.
8. To associate or keep company: used with with: as, to companion with vagabonds.
9. A simplified spelling of companion.

Wiktionary

1. n. A friend, acquaintance, or partner; someone with whom one spends time or keeps company
2. n. A person employed to accompany or travel with another.
3. n. The framework on the quarterdeck of a sailing ship through which daylight entered the cabins below.
4. n. The covering of a hatchway on an upper deck which leads to the companionway; the stairs themselves.
5. n. A knot in whose neighborhood another, specified, knot meets every meridian disk.
6. n. A thing or phenomenon that is closely associated with another thing, phenomenon, or person.
7. n. A celestial object that is associated with another.

GNU Webster's 1913

1. 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.
2. n. A knight of the lowest rank in certain orders.
3. n. A fellow; -- in contempt.
4. n. A skylight on an upper deck with frames and sashes of various shapes, to admit light to a cabin or lower deck.
5. n. A wooden hood or penthouse covering the companion way; a companion hatch.
6. v. To be a companion to; to attend on; to accompany.
7. v. To qualify as a companion; to make equal.

WordNet 3.0

1. n. one paid to accompany or assist or live with another
2. v. be a companion to somebody
3. n. a traveler who accompanies you
4. n. a friend who is frequently in the company of another