Thanks for using this online dictionary, we have been helping millions of people improve their use of the english language with its free online services. English definition of thirties is as below...

Seven-thirties :: Seven-thirties (n. pl.) A name given to three several issues of United States Treasury notes, made during the Civil War, in denominations of $50 and over, bearing interest at the rate of seven and three tenths (thirty hundredths) per cent annually. Within a few years they were all redeemed or funded..

Thirties :: Thirties (pl. ) of Thirt.

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