thirties
noun(thir-ty)
a number equal to three times 10
thirties
noun(thir-ty)
the numbers 30 to 39; specifically : the years 30 to 39 in a lifetime or century
thirties
noun(thir-ty)
a sign of completion : end —usually written 30
thirties
noun(thir-ty)
a rifle that fires a .30 caliber cartridge having a 30 grain powder charge —usually written .30—30