thirty

American  

[thur-tee] / ˈθɜr ti /

noun

plural

thirties

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.

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adjective

1. amounting to 30 in number.

thirty British  

/ ˈθɜːtɪ /

noun

1. 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

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determiner

1. 1. amounting to thirty

      thirty trees

   2. ( as pronoun )

      thirty are broken

Usage

Spelling tips for 30 The word thirty (30) is hard to spell because it doesn’t simply combine the spelling of the base number (three) with the suffix -ty, as is done in other easy-to-remember spellings like sixty and seventy.  How to spell thirty: When three is combined with suffixes, it transforms from three (a cardinal number) to third (an ordinal number).Then, the d is dropped: thirteen (not thirdteen); thirty (not thirdty). Remember: there's no d in thirty.

Etymology

Origin of thirty

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

Example Sentences

The parlor contained at least one sofa, a chest of drawers, and a massive wood table that sat more than thirty.

From Literature

Then very seriously he said, “I’m pretty sure those noises you heard were more monkeys. It sure sounds like it. From what I understand, there were probably about thirty of them.”

From Literature

The data also show that the planet's upper atmosphere has continued to cool over the past thirty years.

From Science Daily

It comes together in just over thirty minutes, which leaves you the radical luxury of eating it slowly.

From Salon

"Everything is powered electrically, including the elevators, which in my case is a problem," said Yuriy Stepanets, in his thirties, smiling from his wheelchair.

From Barron's