Definition of "eighty" []

  • The cardinal number equal to 8 × 10. (noun)
  • A decade or the numbers from 80 to 89: They were still active in their eighties. Before noon, the temperature shot into the eighties. (noun)
  • The decade from 80 to 89 in a century. (noun)
  • The cardinal number that is the product of ten and eight (noun)

American Heritage(R) Dictionary of the English Language, Fifth Edition. Copyright (c) 2011 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.

  • A numeral, 80, LXXX, etc, representing this number (noun)
  • The numbers 80–89, esp a person's age or the year of a particular century (noun)
  • The amount or quantity that is eight times as big as ten (noun)
  • Something represented by, representing, or consisting of 80 units (noun)
  • Amounting to eighty (determiner)
  • (as pronoun) (determiner) (c) HarperCollins Publishers Ltd 2016

Use "eighty" in a sentence
  • "During this term eighty-one students have been enrolled."
  • "“She’s fifty-two,” I said to the nurse but mouthed the word eighty when my mother turned away."
  • "Because the gap between rich and poor has reached its highest in eighty-one years, the need for action is great."