thirty

[ thur-tee ]

noun

, plural thir·ties.

1. a cardinal number, 10 times 3.
2. a symbol for this number, as 30 or XXX.
3. a set of this many persons or things.
4. Printing, Journalism. 30-dash.
5. thirties, the numbers, years, degrees, or the like, from 30 through 39, as in referring to numbered streets, indicating the years of a lifetime or of a century, or referring to degrees of temperature:

   He works in the East Thirties. She must be in her thirties. The temperature was in the thirties yesterday.

adjective

1. amounting to 30 in number.

thirty

/ ˈθɜːtɪ /

noun

1. See number
   the cardinal number that is the product of ten and three See also number
2. a numeral, 30, XXX, etc, representing this number
3. plural the numbers 30–39, esp the 30th to the 39th year of a person's life or of a century
4. the amount or quantity that is three times as big as ten
5. something representing, represented by, or consisting of 30 units

determiner

1. 1. amounting to thirty

      thirty trees

   2. ( as pronoun )

      thirty are broken

Word History and Origins

Origin of thirty¹

before 900; Middle English thritty, Old English thrītig, equivalent to thrī three + -tig -ty ¹; cognate with Dutch dertig, German dreissig, Old Norse thrjātīu

Word History and Origins

Origin of thirty¹

Old English thrītig; see three , -ty ¹

Example Sentences

Thirty-six percent were in favor and 38 percent were opposed.

From The Daily Beast

Thomas Sadoski should be the frontrunner to play every smarmy privileged thirty-something from now on.

From The Daily Beast

I'm to be at his Universal bungalow at twelve-thirty for lunch, to meet him for the first time, going to see a man about a job.

From The Daily Beast

By two-thirty on the first afternoon at his house, I long for a cup of coffee but feel awkward about asking.

From The Daily Beast

Thirty-seven years later, that destiny remains largely unattained.

From The Daily Beast

I presume the twenty-five or thirty miles at this end is unhealthy, even for natives, but it surely need not be so.

From Project Gutenberg

Within the past thirty years civilization has rapidly taken possession of this lovely region.

From Project Gutenberg

I doubt that thirty persons per day are carried into or brought out of it by all public conveyances whatever.

From Project Gutenberg

She began the study of drawing at the age of thirty, and her first attempt in oils was made seven years later.

From Project Gutenberg

The amount of the taxed costs is one hundred and thirty-three, six, four, Mr. Perker.

From Project Gutenberg