moderate: [14] Latin moderārī or moderāre meant ‘reduce, control’. They were derived from an unrecorded *modes- (source also of modest), which was related to modus ‘measure’ (source of English mode and model), and hence denoted etymologically ‘keep within due measure’. Their past participle moderātus was taken over by English as an adjective, and converted into a verb in the 15th century. => mode, model, modern, modest[moderate etymology, moderate origin, 英语词源]