add: [14] Etymologically, add means simply ‘put to’. Its source is Latin addere, a compound verb formed from the prefix ad- ‘to’ and the stem -dere ‘put’ (which is related to English do). Its original meaning in English was simply ‘join one thing to another’; its specific mathematical use did not develop until the early 16th century. => do[add etymology, add origin, 英语词源]