usage (n.)youdaoicibaDictYouDict[usage 词源字典]
c. 1300, "established practice, custom," from Anglo-French and Old French usage "custom, habit, experience; taxes levied," from us, from Latin usus "use, custom" (see use (v.)). From late 14c. as "service, use, act of using something."[usage etymology, usage origin, 英语词源]