/ ˈsevnti; NAmE / number
1.
70
2.
noun the seventies [ pl. ] numbers, years or temperatures from 70 to 79
► seven·ti·eth / ˈsevntiəθ; NAmE / ordinal number , noun
HELP NOTE : There are examples of how to use ordinal numbers at the entry for fifth .
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IDIOMS
- in your seventies
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WORD ORIGIN
Old English hundseofontig , from hund- (of uncertain origin) + seofon seven + -tig .