sev·en·ty

[sev-uhn-tee] noun, plural sev·en·ties, adjective
noun
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.
00:10
Seventy is always a great word to know.
So is ort. Does it mean:
a scrap or morsel of food left at a meal.
a children's mummer's parade, as on the Fourth of July, with prizes for the best costumes.

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

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World English Dictionary
seventy (ˈsɛvəntɪ) [Click for IPA pronunciation guide]
 
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
Simply put, you cannot heat a seventy degree room by bringing in ice water.
The whole rehab center seemed to be full of seventy year olds all seemingly seventy pounds over weight.
Lexicon employs two in-house linguists and consults with seventy-seven others
  around the world.
Seventy others were sent to hospitals, escaped, or perished.
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