What is the meaning of the word achivalry?

Medieval Knightley system

Do you mean chivalry?

chiv·al·ryˈSHivəlrē/nounthe medieval knightly system with its religious, moral, and social code.historicalknights, noblemen, and horsemen collectively."I fought against the cream of French chivalry"the combination of qualities expected of an ideal knight, especially courage, honor, courtesy, justice, and a readiness to help the weak.synonyms:knight errantry, courtly manners, knightliness, courtliness, nobility;