Definition of "fifties" in English

noun

1. plural of fifty

noun

1. The decade of the 1850s, 1950s, etc.

   • I will probably be dead by the fifties.

2. The decade of one's life from age 50 through age 59.

   • You don't really start living until you're in your fifties!

3. (temperature, rates) The range between 50 and 59 Fahrenheit.

   • It can't snow tonight; it's forecast to be in the fifties!

adjective

1. From or evoking the 51st through 60th years of a century (chiefly the 1950s).

   • Don't bring ambrosia, this isn't a fifties potluck.