ninety

ninety /ˈnaɪnti/ noun
plural nineties
ninety
/ˈnaɪnti/
noun
plural nineties
Britannica Dictionary definition of NINETY
1 
[count] : the number 90
2 
nine*ties [plural]
a  : the numbers ranging from 90 to 99
b  : a set of years ending in digits ranging from 90 to 99

— ninetieth

/ˈnaɪntijəθ/ noun, plural ninetieths [count]

— ninety

pronoun