Definition of thirty
- wrote thirty on the last page of the story
The temperature outside is in the high thirties.
He is in his thirties.
These example sentences are selected automatically from various online news sources to reflect current usage of the word 'thirty.' Views expressed in the examples do not represent the opinion of Merriam-Webster or its editors. Send us feedback.
: the number 30
thirties : the numbers ranging from 30 to 39
: a set of years ending in digits ranging from 30 to 39
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