/ ˈʃɪvəlri; NAmE / noun [ U ]
1.
polite and kind behaviour that shows a sense of honour, especially by men towards women
2.
(in the Middle Ages) the religious and moral system of behaviour which the perfect knight was expected to follow
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WORD ORIGIN
Middle English : from Old French chevalerie , from medieval Latin caballerius , for late Latin caballarius horseman, from Latin caballus horse.