The Collaborative International Dictionary of English v.0.48:
Knight bachelor \Knight" bach"e*lor\; pl. Knights bachelors. A knight of the most ancient, but lowest, order of English knights, and not a member of any order of chivalry. See Bachelor, 4. [1913 Webster]WordNet (r) 3.0 (2006):
knight bachelor n 1: a knight of the lowest order; could display only a pennon [syn: knight bachelor, bachelor-at-arms, bachelor]