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caval- (Latin: horse [caballus, a horseman; by extension, a gentleman serving as a lady's escort. Also said to mean: "an inferior horse, a nag"] > Italian [caballeria from caballo, "horse"] > French [cavalerie]).


cavalier:
1. An armed horseman; knight.
2. A gallant or courteous gentleman, especially one serving as a lady's escort.
calvary:
Combat troops mounted originally on horses but now often on motorized armored vehicles, for greater mobility.