Thirty

Definition

Thirty refers to the cardinal number equal to three times ten or the number following twenty-nine and preceding thirty-one.

Parts of Speech

• Noun
• Adjective

Pronunciation

American English

• IPA Pronunciation: /ˈθɜːr.ti/
• Respelling: THUR-tee

British English

• IPA Pronunciation: /ˈθɜː.ti/
• Respelling: THUR-tee

Etymology

The word "thirty" originates from Old English "þrītig," a compound of "þrīe" (three) and "tig" (group of ten). It is related to Proto-Germanic "*þrīe tigu" and Proto-Indo-European "*tréyes" (three).

Derivatives

• Thirtieth (adjective/noun)
• Thirtyfold (adjective/adverb)
• Thirtyish (adjective, informal)
• Thirty-second (adjective/noun)
• Thirtysomethings (noun, informal)

Synonyms

• XXX (Roman numeral)
• Three tens
• Half of sixty

Antonyms

• None

Usage

The word "thirty" is used as a number to denote a quantity, as in "There are thirty students in the class." It can also describe an age, as in "He turned thirty last month."

Related Terms

• Three: The cardinal number equivalent to 3.
• Tens: Groups of ten.
• Thirtyfold: Multiplied by thirty.

Detailed Definitions

Noun

• A cardinal number representing three tens: Refers to the numerical value of 30.
  • Example: "She collected thirty shells at the beach."
• A period or age of thirty years: Refers to a person's age or a group of years.
  • Example: "He spent his thirties traveling the world."

Adjective

• Being thirty in number: Describes a quantity or amount equal to 30.
  • Example: "There are thirty chairs in the room."