thirtieth

American  

[thur-tee-ith] / ˈθɜr ti ɪθ /

adjective

1. next after the twenty-ninth; being the ordinal number for 30.

2. being one of 30 equal parts.

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noun

1. a thirtieth part, especially of one (1/30).

2. the thirtieth member of a series.

ˈthirtieth British  

/ ˈθɜːtɪɪθ /

adjective

1. (usually prenominal)

   1. being the ordinal number of thirty in counting order, position, time, etc: often written 30th

   2. ( as noun )

      the thirtieth of the month

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noun

1. 1. one of 30 approximately equal parts of something

   2. ( as modifier )

      a thirtieth part

2. the fraction equal to one divided by 30 ( 1/ 30 )

Etymology

Origin of thirtieth

before 900; thirty + -eth ²; replacing Middle English thrittythe, Old English thrītegtha

Example Sentences

The difference: Your guests won’t have to feign enthusiasm after the thirtieth photo of you “holding up” the Leaning Tower of Pisa.

From The Wall Street Journal

After the thirtieth consecutive month without rain, the townsfolk of San Francisco de Conchos in the northern Mexican state of Chihuahua gather to plead for divine intervention.

From BBC

Wisconsin, a free state, becomes the thirtieth state.

From Literature

Bobby took the elevator to the thirtieth floor of the skyscraper at 110 West Fortieth Street, on the edge of the garment district, and when he disembarked, the elevator operator pointed to a doorway.

From Literature

As I listened to the phone ring for about the thirtieth time, suddenly it occurred to me: why not just run up to North Hampden and get it?

From Literature