9 Grammatical Pitfalls


[ey-tee] /ˈeɪ ti/
noun, plural eighties.
a cardinal number, ten times eight.
a symbol for this number, as 80 or LXXX.
a set of this many persons or things.
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.
amounting to 80 in number.
Origin of eighty
before 850; Middle English eighteti, Old English eahtatig. See eight, -ty1 Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2015.
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Examples from the web for eighty
  • eighty percent of the lava was produced during a single pulse of eruptions, she added.
  • eighty-seven percent of the peninsula's glaciers have been retreating during the same period, he added.
  • eighty-six adult pandas have also been confirmed safe.
  • See tractors and other farm equipment spanning the last eighty years.
  • The injunction may forestall calamity by keeping the wheels of industry turning for an additional eighty days.
  • Since then the county has seen an average of eighty-one cases a year.
  • eighty patients with irritable bowel syndrome were instructed to take two sugar pills daily.
  • eighty-two percent of the animal's genes are found in other mammals.
  • eighty percent of the dingoes there are hybrids, and pure dingoes exist in only two remote, mountainous areas.
  • Saving that six million cost thousands of lives and eighty billion.
British Dictionary definitions for eighty


noun (pl) -ies
the cardinal number that is the product of ten and eight See also number (sense 1)
a numeral, 80, LXXX, etc, representing this number
(pl) the numbers 80–89, esp a person's age or the year of a particular century
the amount or quantity that is eight times as big as ten
something represented by, representing, or consisting of 80 units
  1. amounting to eighty: eighty pages of nonsense
  2. (as pronoun): eighty are expected
Word Origin
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
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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
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