fifties /ˈfɪftiz/noun 3adjective 1 noun[plural only]3 •The sixth decade of a century: the 1850s, 1950s, 2050s, etc.I will probably be dead by the fifties. •The decade of one's life from age 50 through age 59.You don't really start living until you're in your fifties! •The range between 50 and 59 Fahrenheit.It can't snow tonight; it's forecast to be in the fifties! adjective1 •From or evoking the 51st through 60th years of a century (chiefly the 1950s).Don't bring ambrosia, this isn't a fifties potluck.
