thirtieth

[ thur-tee-ith ]

adjective

1. next after the twenty-ninth; being the ordinal number for 30.
2. being one of 30 equal parts.

noun

1. a thirtieth part, especially of one (1/30).
2. the thirtieth member of a series.

ˈthirtieth

/ 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

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 )

Word History and Origins

Origin of thirtieth¹

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

Example Sentences

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

Even in 1801 we can still catch Coleridge resolving that ‘before my thirtieth year I will thoroughly understand the whole of Newton’s works.’

From Literature

It’s hard to overlook, for instance, that this movie arrives in theatres in the same year as the thirtieth anniversary of Spike Lee’s “Do The Right Thing.”

From The New Yorker