eighty

1 ENTRIES FOUND:
eighty /ˈeɪti/ noun
plural eighties
eighty
/ˈeɪti/
noun
plural eighties
Britannica Dictionary definition of EIGHTY
1 
[count] : the number 80
2 
eighties [plural]
a  : the numbers ranging from 80 to 89
b  : a set of years ending in digits ranging from 80 to 89

— eightieth

/ˈeɪtijəθ/ noun, plural eightieths [count]