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.

Origin of eighty

before 850; Middle English eighteti, Old English eahtatig. See eight, -ty1
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018

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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

Word Origin for eighty

Old English eahtatig; related to Old Frisian achtig, Old High German ahtozug
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012

Word Origin and History for eighty

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

Online Etymology Dictionary, © 2010 Douglas Harper