noun, plural eight·ies.

  1. a cardinal number, ten times eight.
  2. a symbol for this number, as 80 or LXXX.
  3. a set of this many persons or things.
  4. eighties, the numbers, years, degrees, or the like, from 80 through 89, as in referring to numbered streets, indicating the years of a lifetime or of a century, or degrees of temperature.


  1. amounting to 80 in number.

noun plural -ies

  1. the cardinal number that is the product of ten and eightSee also number (def. 1)
  2. a numeral, 80, LXXX, etc, representing this number
  3. (plural) the numbers 80–89, esp a person’s age or the year of a particular century
  4. the amount or quantity that is eight times as big as ten
  5. something represented by, representing, or consisting of 80 units


    1. amounting to eightyeighty pages of nonsense
    2. (as pronoun)eighty are expected

eigteti (late 13c.), from eight + -ty (1). Replacing Old English hundeahtatig, with hund- “ten.” Related: Eightieth.

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