a man of any age who has not been married.-an unmarried woman.-a person who has taken the first or lowest degree in the liberal arts, or in some branch of science, at a college or university; as, a bachelor of arts.-a knight who had no standard of his own, but fought under the standard of another in the field; often, a young knight.-in the companies of london tradesmen, one not yet admitted to wear the livery; a junior member.-a kind of bass, an edible fresh-water fish (pomoxys annularis) of the southern united states.