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Definition of thirty

thirty

/ˈθɜːrti/
thir · ty
Plural:thirties
•
Adjective:thirtieth
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thirty Lexical Profile

thirty Game Scores & Validity

• adjective

1

Amounting to three times ten in number; one more than twenty-nine.

Example

"The lecture hall accommodated thirty students comfortably during the morning seminar."

• noun

1

The cardinal number equivalent to the product of three and ten; one more than twenty-nine, or the symbols (30, XXX) representing it.

Example

"She reached the age of thirty last month and celebrated with a quiet dinner."

2

The numbers from thirty to thirty-nine, especially the years of a century or of a person's life (used in the plural).

Example

"Many artists produced their most influential works during their thirties."

• Rhymes for thirty

• Nearby Words

thirteenth
thirties
thirtieth
thirty
thirtyfold
thirtyish
thirtysomething

Word Origin & Etymology

From Old English 'þrītig', a compound of the root of 'three' and '-tig' (a group of ten), originating from Proto-Germanic '*þrīz' and '*teguz'.

Cite this Entry

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