From The Collaborative International Dictionary of English v.0.48 [gcide]:
1. 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.
4. [Cf. OSp. compa[~n]a an outhouse, office.] (Naut.) (a) A skylight on an upper deck with frames and sashes of various shapes, to admit light to a cabin or lower deck. (b) A wooden hood or penthouse covering the companion way; a companion hatch.
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