Definitions

from The American Heritage® Dictionary of the English Language, 5th Edition.

  • noun The cardinal number equal to 8 × 10.
  • noun A decade or the numbers from 80 to 89.
  • noun The decade from 80 to 89 in a century.

from The Century Dictionary.

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

from the GNU version of the Collaborative International Dictionary of English.

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

from Wiktionary, Creative Commons Attribution/Share-Alike License.

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

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

  • noun the cardinal number that is the product of ten and eight
  • adjective being ten more than seventy

Etymologies

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

[Middle English eighti, from Old English eahtatig; see oktō(u) in Indo-European roots.]

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