English Dictionary

forties

noun

The decade of the 1840s, 1940s, etc. / The decade of one's life from age 40 through age 49. / (temperature, rates, plural only) The range between 40 and 49.

The forties were a time of great change and innovation.

意味（1）

The decade of the 1840s, 1940s, etc.

意味（2）

The decade of one's life from age 40 through age 49.

They're both in their forties.

意味（3）

(temperature, rates, plural only) The range between 40 and 49.

What to wear when the weather is in the forties really depends on whether you're talking fahrenheit or celsius.