from The American Heritage® Dictionary of the English Language, 4th Edition

  • n. The cardinal number equal to 8 × 10.
  • n. A decade or the numbers from 80 to 89: They were still active in their eighties. Before noon, the temperature shot into the eighties.
  • n. The decade from 80 to 89 in a century.

from Wiktionary, Creative Commons Attribution/Share-Alike License

  • n. The cardinal number occurring after seventy-nine and before eighty-one, represented in Roman numerals as LXXX and in Arabic numerals as 80.

from the GNU version of the Collaborative International Dictionary of English

  • adj. Eight times ten; fourscore.
  • n. The sum of eight times ten; eighty units or objects.
  • n. A symbol representing eighty units, or ten eight times repeated, as 80 or lxxx.

from The Century Dictionary and Cyclopedia

  • Eight times ten, or one more than seventy-nine; fourscore: a cardinal numeral.
  • n. The number greater by one than seventy-nine; the sum of eight tens.
  • n. A symbol representing eighty units, as 80, or LXXX, or lxxx.

from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.

  • n. the cardinal number that is the product of ten and eight
  • adj. being ten more than seventy


Middle English eighti, from Old English eahtatig; see oktō(u) in Indo-European roots.
(American Heritage® Dictionary of the English Language, Fourth Edition)



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