OXFORD DICTIONARY
Bachelor, n.
1 an unmarried man.
2 a man or woman who has taken the degree of Bachelor of Arts or Science etc.
3 hist. a young knight serving under another's banner.
bachelor girl an independent unmarried young woman. bachelor's buttons any of various button-like flowers, esp. the double buttercup.
bachelorhood n. bachelorship n.
ME & OF bacheler aspirant to knighthood, of uncert. orig.
THESAURUS
Bachelor
Bayard, Don Quixote, Gawain, Lancelot, Ritter, Sidney, Sir Galahad, baccalaureate, baccalaureus, bach, banneret, baronet, caballero, cavalier, chevalier, companion, confirmed bachelor, degree, doctor, doctorate, knight, knight bachelor, knight banneret, knight baronet, knight-errant, master, old bach, single man
ROGET THESAURUS
Bachelor
Celibacy
N
celibacy, singleness, single blessedness, bachelorhood, bachelorship, misogamy, misogyny, virginity, pucelage, maidenhood, maidenhead, unmarried man, bachelor, Coelebs, agamist, old bachelor, misogamist, misogynist, monogamist, monk, unmarried woman, spinster, maid, maiden, virgin, feme sole, old maid, bachelor girl, girl-bachelor, nun, unmarried, unwed, unwedded, wifeless, spouseless, single.