seventy

[sev-uhn-tee]
noun, plural seventies.
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.
adjective
6.
amounting to 70 in number.

Origin:
1150–1200; Middle English; Old English seofontig. See seven, -ty1

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seventy (ˈsɛvəntɪ)
 
n , pl -ties
1.  See also number the cardinal number that is the product of ten and seven
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
 
determiner
6.  a.  amounting to seventy: the seventy varieties of fabric
 b.  (as pronoun): to invite seventy to the wedding
 
[Old English seofentig]

Collins English Dictionary - Complete & Unabridged 10th Edition
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Etymonline
Word Origin & History

seventy
O.E. (hund)seofontig, from seofon (see seven) + -tig (see -ty (1)). Cf. O.Fris. soventich, M.Du. seventich, O.N. sjau tiger.
Online Etymology Dictionary, © 2010 Douglas Harper
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Example sentences
There are now over seventy, small, family-owned wineries in the region.
It would take another seventy years before anyone would try to do away with
  this severe penal code.
Seventy percent of world water use is for agriculture, and again, some foods
  are worse than others.
Seventy-one of them were freed only last summer, after having to sign a letter
  admitting their part in inciting violent protests.
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