Толковый словарь английского языка Oxford English Reference - customary

adj. & n. --adj. 1 usual; in accordance with custom. 2 Law in accordance with custom. --n. (pl. -ies) Law a book etc. listing the customs and established practices of a community. Derivatives customarily adv. customariness n. Etymology: med.L custumarius f. custuma f. AF custume (as CUSTOM)