- eighty (n.)[eighty 词源字典]
- eigteti (late 13c.), from eight + -ty (1). Replacing Old English hundeahtatig, with hund- "ten." Related: Eightieth.[eighty etymology, eighty origin, 英语词源]
- fourscore (n.)
- "eighty, four times twenty," mid-13c., "formerly current as an ordinary numeral" [OED], from four + score (n.). Archaic by the time Lincoln used it at Gettysburg in 1863. Related: Fourscorth "eightieth."