thirties
noun C2- The fourth decade of a century: the 1830s, 1930s, 2030s, etc. · It says here on your resume that your last job was as a streetcorner apple vendor and that you haven't worked since the thirties.
- The decade of one's life from age 30 through age 39. · He looked to be in his thirties.· I have a mid-thirties male found down, unresponsive.
- The range between 30 and 39. · It's going to be in the low thirties tonight.
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