Meaning of “forty” - Learner’s Dictionary

forty

us uk /ˈfɔːti/

A2 the number 40

Examples

the forties

the years from 1940 to 1949

be in your forties

to be aged between 40 and 49

fortieth

40th written as a word

(Definition of “forty” from the Cambridge Learner’s Dictionary © Cambridge University Press)