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
Add to that a demographic backdrop that means there are twice as many Ukrainians in their late thirties, owing to a 1980s baby boom, as in their early twenties, when families grappling with the uncertainties of post-Soviet Ukraine weren’t rushing to have kids.
—
Olesia Safronova, Fortune, 26 May 2024
He is stunted enough to still be hung up on his first love in his thirties—and yet too shy to own up to his feelings.
—Hazlitt, 15 May 2024
Marla Towey was in her late thirties, with two children and an ex-husband who worked for SEPTA.
—Emily Harnett, Harper's Magazine, 26 Apr. 2024
In my thirties, the combination of fresh inflammation and scar tissue from a teenage surgery had blocked up my bowel.
—Andrew Chapman, Longreads, 18 Apr. 2024
See all Example Sentences for thirty 
Olesia Safronova, Fortune, 26 May 2024
He is stunted enough to still be hung up on his first love in his thirties—and yet too shy to own up to his feelings.
—Hazlitt, 15 May 2024
Marla Towey was in her late thirties, with two children and an ex-husband who worked for SEPTA.
—Emily Harnett, Harper's Magazine, 26 Apr. 2024
In my thirties, the combination of fresh inflammation and scar tissue from a teenage surgery had blocked up my bowel.
—Andrew Chapman, Longreads, 18 Apr. 2024
See all Example Sentences for thirty
These examples are programmatically compiled from various online sources to illustrate current usage of the word 'thirty.' Any opinions expressed in the examples do not represent those of Merriam-Webster or its editors. Send us feedback about these examples.
Dictionary Entries Near thirty
Cite this Entry
“Thirty.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/thirty. Accessed 6 Jun. 2024.
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