Longman Dictionary of Contemporary English homepage

Language: Old English
Origin: seofontig, from seofon 'seven'

seventy

 number
     
sev‧en‧ty
1 the number 70
2

the seventies

[plural] also the '70s, the 1970sTMC the years from 1970 to 1979:
We lost touch during the seventies.
the early/mid/late seventies
In the early seventies, Sag Harbor was still a peaceful village.
3

be in your seventies

TMC to be aged between 70 and 79
early/mid/late seventies
Bill must be in his mid seventies now.
4

in the seventies

if the temperature is in the seventies, it is between 70 degrees and 79 degrees
in the low/mid/high seventies
sunny, with temperatures in the mid seventies
—seventieth adjective:
her seventieth birthday
Definition from the Longman Dictionary of Contemporary English
Advanced Learner's Dictionary.

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