Longman Dictionary of Contemporary English homepage

Language: Old English
Origin: thritig, from thrie 'three'

thirty

 number
     
Related topics: Numbers, Chronology
thir‧ty
1HMN the number 30
2

the thirties

[plural] also the '30s, the 1930sTMC the years from 1930 to 1939:
In the thirties, air travel really began to take off.
the early/mid/late thirties
The family sold the house in the early thirties.
3

be in your thirties

to be aged between 30 and 39
early/mid/late thirties
She must be in her early thirties by now.
4

in the thirties

if the temperature is in the thirties, it is between 30 degrees and 39 degrees
in the low/mid/high thirties
a hot day, with temperatures in the low thirties
—thirtieth adjective, pronoun:
her thirtieth birthday
I'm planning to leave on the thirtieth (=the 30th day of the month).
Definition from the Longman Dictionary of Contemporary English
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