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From The Collaborative International Dictionary of English v.0.48:
Seaman \Sea"man\, n.; pl. Seamen. [AS. saeman.] One whose occupation is to assist in the management of ships at sea; a mariner; a sailor; -- applied both to officers and common mariners, but especially to the latter. Opposed to landman, or landsman. [1913 Webster] Able seaman, a sailor who is practically conversant with all the duties of common seamanship. Ordinary seaman. See Ordinary. [1913 Webster]