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seventy

[sev-uh n-tee]
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noun, plural sev·en·ties.
  1. a cardinal number, 10 times 7.
  2. a symbol for this number, as 70 or LXX.
  3. a set of this many persons or things.
  4. seventies, the numbers, years, degrees, or the like from 70 through 79, as in referring to numbered streets, indicating the years of a lifetime or of a century, or referring to degrees of temperature: They live in the Seventies. His uncle is in his early seventies. It was in the seventies yesterday.
  5. the Seventy, the body of scholars who produced the Septuagint.
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adjective
  1. amounting to 70 in number.
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Origin of seventy

1150–1200; Middle English; Old English seofontig. See seven, -ty1
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018

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British Dictionary definitions for seventies

seventy

noun plural -ties
  1. the cardinal number that is the product of ten and sevenSee also number (def. 1)
  2. a numeral, 70, LXX, etc, representing this number
  3. (plural) the numbers 70–79, esp the 70th to the 79th year of a person's life or of a particular century
  4. the amount or quantity that is seven times as big as ten
  5. something represented by, representing, or consisting of 70 units
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determiner
    1. amounting to seventythe seventy varieties of fabric
    2. (as pronoun)to invite seventy to the wedding
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Word Origin

Old English seofentig
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

Word Origin and History for seventies

n.

1859 as the years of someone's life between 70 and 79; from 1837 as the eighth decade of years in a given century. See seventy.

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seventy

Old English (hund)seofontig, from seofon (see seven) + -tig (see -ty (1)). Cf. Old Frisian soventich, Middle Dutch seventich, Old Norse sjau tiger.

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Online Etymology Dictionary, © 2010 Douglas Harper