Definitions

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

  • n. The ordinal number matching the number 80 in a series.
  • n. One of 80 equal parts.

from Wiktionary, Creative Commons Attribution/Share-Alike License

  • adj. The ordinal form of the number eighty.
  • n. The person or thing in the eightieth position.
  • n. One of eighty equal parts of a whole.

from the GNU version of the Collaborative International Dictionary of English

  • adj. The next in order after seventy-ninth.
  • adj. Consisting of one of eighty equal parts or divisions.
  • n. The quotient of a unit divided by eighty; one of eighty equal parts.

from The Century Dictionary and Cyclopedia

  • Next after the seventy-ninth: an ordinal numeral.
  • n. The quotient of unity divided by eighty; one of eighty equal parts.

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

  • adj. the ordinal number of eighty in counting order
  • n. position 80 in a countable series of things

Etymologies

eighty +‎ -eth (Wiktionary)

Examples

  • Lady Bird Johnson celebrated her eightieth birthday in her red evening gown.

    A Renegade History of the United States

  • What drives you—just months shy of your eightieth birthday—to continue to work so hard?

    Soul Trapper

  • I know Apache and he's no Apache., but he looked so white, you'd have taken him for eightieth generation Bostonian.

    Tales from the old Sonoran desert # 47

  • No wonder that I backed out one afternoon without raising the door, smashing it to pieces, like an idiot, or a man speeding into his eightieth year.

    Homestead

  • Ertegun explained: The name Atlantic was probably about our eightieth choice, because every name we came up with . . . had already been taken. . .

    The Man Behind the Music

  • He defined real intelligence as akin to being on the eightieth floor of a building while everyone else is on the ground trying to find their way with a map.

    Molly Baker: Steve Jobs: Oh Captain (Of Industry) My Captain!

  • Her mother-in-law, Jessie Danz, was active in the Seattle Jewish Family and Child Services for many years, and Carolyn chaired the organization's eightieth anniversary celebration in 1972.

    Personal Information for Carolyn Blumenthal Danz

  •            Of his own end, Grandpa had often said to me and Grace as though teasing us with a riddle, "I will spring into my eightieth year, but I will not spring out of it."

    The Legacy

  • In celebration of Stephen Sondheim's eightieth birthday, his songs are being sung even more this year than they usually are -- which in Manhattan intimate rooms is quite often, to say the least.

    David Finkle: First Nighter: Stephen Sondheim Wants to Know

  • Ted Kennedy, Bork's chief antagonist in the Senate, might have found that task particularly unpleasant a year after sending Brennan a 50-year-old bottle of Irish whiskey to mark his eightieth birthday.

    Seth Stern: When Ideology in Supreme Court Confirmations Goes Too Far

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