Quantcast
Merriam-Webster Logo
  • Dictionary
  • Thesaurus
  • Scrabble
  • Spanish Central
  • Learner's Dictionary

forty

play
noun, for·ty \ˈfȯr-tē\

Simple Definition of forty

  • : the number 40

  • forties : the numbers ranging from 40 to 49

  • : a set of years ending in digits ranging from 40 to 49

Source: Merriam-Webster's Learner's Dictionary

Full Definition of forty

plural forties

  1. 1 — see number table

  2. 2 plural :  the numbers 40 to 49; specifically :  the years 40 to 49 in a lifetime or century

  3. 3 :  the third point scored by a side in a game of tennis

fortieth play \ˈfȯr-tē-əth\ adjective or noun
forty adjective
forty pronoun, plural in construction
fortyish play \-tē-ish\ adjective

Examples of forty in a sentence

  1. The temperature outside is in the high forties.

  2. She is in her forties.



Origin of forty

Middle English fourty, adjective, from Old English fēowertig, from fēowertig group of 40, from fēower four + -tig group of 10; akin to Old English tīen ten


First Known Use: before 12th century

Other Number-Related Terms

Rhymes with forty


FORTY Defined for Kids

1

forty

play
adjective for·ty \ˈfȯr-tē\

Definition of forty for Students

  1. :  being four times ten




2

forty

play
noun for·ty

Definition of forty for Students

  1. :  four times ten :  40




Learn More about forty


Seen and Heard

What made you want to look up forty? Please tell us where you read or heard it (including the quote, if possible).

WORD OF THE DAY

the range of perception or understanding

Get Word of the Day daily email!

WORD GAMES

Take a 3-minute break and test your skills!

alt-5746713d76276

Which of these is a synonym of nonplus?

reduce perplex soothe disapprove
Name That Thing

Test your visual vocabulary with our 10-question challenge!

TAKE THE QUIZ
SCRABBLE® Sprint

Test Your Knowledge - and learn some interesting things along the way.

TAKE THE QUIZ