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

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.

Read more on BBC

Wisconsin, a free state, becomes the thirtieth state.

Read more on Literature

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

Read more on 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?

Read more on 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.’

Read more on Literature