Cav′a‐lier″ (kăv′ȧ‐lēr″), n. [F. cavalier, It. cavaliere, LL. caballarius, fr. L. caballus. See Cavalcade, and cf. Chevalier, Caballine.] 1. A military man serving on horseback; a knight.
2. A gay, sprightly, military man; hence, a gallant.
3. One of the court party in the time of king Charles I. as contrasted with a Roundhead or an adherent of Parliament. Clarendon.
4. (Fort.) A work of more than ordinary height, rising from the level ground of a bastion, etc., and overlooking surrounding parts.