diminution (n.)youdaoicibaDictYouDict[diminution 词源字典]
c. 1300, from Anglo-French diminuciun, Old French diminucion, from Latin diminutionem (nominative diminutio), earlier deminutionem, noun of action from past participle stem of deminuere (see diminish).[diminution etymology, diminution origin, 英语词源]