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

All that we know is that he passed away in the intake room of the jail one day after his thirtieth birthday.

From Slate

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

By the time they reached the thirtieth game, Bobby had won nine games and Spassky five.

From Literature

“Thirtieth Street is out of fashion,” he declares.

From New York Times