plural thirties
1
: a number equal to three times 10 see Table of Numbers
2
thirties plural
: the numbers 30 to 39
specifically
: the years 30 to 39 in a lifetime or century
3
: a sign of completion : end
—usually written 30
wrote thirty on the last page of the story
4
: the second point scored by a side in a game of tennis
thirty
adjective
thirty
pronoun, plural in construction
Examples of thirty in a Sentence
The temperature outside is in the high thirties.
He is in his thirties.
Recent Examples on the Web
Since reaching his mid-thirties, the topic of Neuer’s succession has been on steady play in the German media.
—
Sebastian Stafford-Bloor, New York Times, 8 Apr. 2026
In the thirties, elixir sulfanilamide, an antibiotic mixed into a toxic solvent, gave patients intense pain, kidney failure, and neurological problems.
—Dhruv Khullar, New Yorker, 6 Apr. 2026
All her siblings also died of ALS in their late thirties and early forties.
—Jon Lapook, CBS News, 4 Apr. 2026
The declines were concentrated among prime working-age men (twenties to thirties); young women between ages 20 and 24; and men over 55.
—Eva Roytburg, Fortune, 3 Apr. 2026
See All Example Sentences for thirty
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Sebastian Stafford-Bloor, New York Times, 8 Apr. 2026
In the thirties, elixir sulfanilamide, an antibiotic mixed into a toxic solvent, gave patients intense pain, kidney failure, and neurological problems.
—Dhruv Khullar, New Yorker, 6 Apr. 2026
All her siblings also died of ALS in their late thirties and early forties.
—Jon Lapook, CBS News, 4 Apr. 2026
The declines were concentrated among prime working-age men (twenties to thirties); young women between ages 20 and 24; and men over 55.
—Eva Roytburg, Fortune, 3 Apr. 2026
See All Example Sentences for thirty
Cite this Entry
“Thirty.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/thirty. Accessed 9 Apr. 2026.
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