Quantcast
Merriam-Webster Logo
  • Dictionary
  • Thesaurus
  • Medical
  • 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

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

for·ti·eth play \ˈfȯr-tē-əth\ adjective or noun
forty adjective
forty pronoun, plural in construction
for·ty·ish play \-tē-ish\ adjective

Examples of forty

  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


FORTIETH Defined for Kids

1

fortieth

adjective for·ti·eth \ˈfȯr-tē-əth\

Definition of fortieth

  1. :  coming right after 39th




2

fortieth

noun for·ty

Definition of fortieth

  1. :  number 40 in a series




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

February 12, 2016

of, relating to, or suggestive of marble

Get Word of the Day daily email!

WORD GAMES

Take a 3-minute break and test your skills!

image33683556

How much does a batman (the Turkish unit of measurement) weigh?

196.5 pounds 2.2 pounds 16.96 pounds 100 pounds
Name That Thing

10 quick questions: hear them, spell them, and see how your skills compare to the crowd.

TAKE THE QUIZ
SCRABBLE® Sprint

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

TAKE THE QUIZ