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Definition of forty

forty

/ˈfɔːr.ti/
for · ty

Plural:forties
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forty Lexical Profile

forty Game Scores & Validity

• adjective

1

Amounting to four times ten in number; one more than thirty-nine.

Example

"The historic library houses over forty rare manuscripts from the sixteenth century."

• noun

1

The cardinal number equivalent to the product of four and ten; one more than thirty-nine (40).

Example

"She celebrated turning forty with a quiet dinner among close friends."


2

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

Example

"Many people achieve their greatest professional stability during their forties."

Word Nuance & Usage

Unlike 'four' and 'fourteen', 'forty' is spelled without a 'u'; writing 'fourty' is a common spelling error in modern English.

• Rhymes for forty

Word Origin & Etymology

From Old English feowertig, a compound of feower ('four') and -tig ('group of ten'), of Proto-Germanic origin.

Cite this Entry


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