n. A horseman, especially an armed horseman; a knight.n. n. One who has the spirit or bearing of a knight; especially, a bold, reckless, and gay fellow.n. [capitalized] The appellation given to the partizans of Charles I. of England in his contest with Parliament.n. During some years they were designated as Cavaliers and Roundheads. They were subsequently called Tories and Whigs.n. A man attending on or escorting a woman, or acting as her partner in dancing; a gallant; a beau.n. In medieval fortification, a mound defended by walls and the like, raised so as to command the neighboring ramparts; hence, in modern fort., a raised work commonly situated within the bastion, but sometimes placed in the gorges, or on the middle of the curtain.n. In the manège, one who understands horse-manship; a skilled or practised rider.Knightly; brave; warlike.Gay; sprightly; easy; offhand; frank; careless.Haughty; disdainful; supercilious: as, a rude and cavalier answer.[capitalized] Belonging or relating to the party of Charles I. of England.To act as a cavalier; ape the manners of a cavalier; carry one's self in a disdainful or high-handed fashion: sometimes followed by it: as, to try to cavalier it over one's associates.