1292, from O.Fr. chevalerie "horsemanship," from chevaler "knight," from M.L. caballarius "horseman," from L. caballus (see cavalier). From "mounted knight," meaning stretched 14c. to "courtly behavior."
The methods of training and standards of behavior for knights in the Middle Ages. The code of chivalry emphasized bravery, military skill, generosity in victory, piety, and courtesy to women. (Comparecourtly love.)