- decade
[decade 词源字典]
- decade: see decimal
[decade etymology, decade origin, 英语词源] - decade (n.)
- mid-15c., "ten parts" (of anything; originally in reference to the books of Livy), from Middle French décade (14c.), from Late Latin decadem (nominative decas), from Greek dekas (genitive dekados) "group of ten," from deka "ten" (see ten). Meaning "period of ten years" is 1590s in English.