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Definition of thirtieth

thirtieth

/ˈθɝː.ti.ɪθ/
thir · ti · eth
Plural:thirtieths
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thirtieth Lexical Profile

thirtieth Game Scores & Validity

• adjective

1

Constituting number thirty in a sequence; coming immediately after the twenty-ninth in order.

Example

"The historical society is celebrating the thirtieth anniversary of its founding this autumn."

2

Constituting one of thirty equal parts into which a whole may be divided.

Example

"Each participating school received a thirtieth share of the regional science grant."

Synonyms
View all synonyms for thirtieth

• noun

1

The person or thing in the number thirty position in a sequence, or the thirtieth day of a month.

Example

"The final payment for the semester is due on the thirtieth of November."

2

One of thirty equal parts of a whole; a fraction equal to 1/30.

Example

"A single day represents roughly one thirtieth of a typical calendar month."

• adverb

1

In the thirtieth place or position in a sequence or competition.

Example

"Despite a minor injury early in the race, the marathon runner finished thirtieth out of five hundred competitors."

• Nearby Words

thirteen
thirteenth
thirties
thirtieth
thirty
thirtyfold
thirtyish

Word Origin & Etymology

From Middle English thirtithe, from Old English thrītigotha, formed from thrītig ('thirty') and the ordinal suffix -tha.

Cite this Entry

Wordmom. (2026). Definition of Thirtieth. In Wordmom Dictionary. Retrieved Nov 5, 2026, from https://wordmom.com/dictionary/thirtieth
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