/ ˈeɪti; NAmE / number
1.
80
2.
noun the eight·ies [ pl. ] numbers, years or temperatures from 80 to 89
► eight·ieth / ˈeɪtiəθ; NAmE / ordinal number , noun
HELP NOTE : There are examples of how to use ordinal numbers at the entry for fifth .
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IDIOMS
- in your eighties
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WORD ORIGIN
Old English hunde(a)htatig , from hund (of uncertain origin) + e(a)hta eight + -tig (now -ty ); the first element was lost early in the Middle English period.