thir·ty 
/ˈθɚti/ noun
plural thir·ties /ˈθɚti/ noun 1 [count] : the number 30 2 thirties [plural] a : the numbers ranging from 30 to 39
▪ The temperature outside is in the high thirties.
b : a set of years ending in digits ranging from 30 to 39
▪ He is in his thirties. ▪ old photographs from the thirties [=from 1930–1939]
▪ The temperature outside is in the high thirties.
b : a set of years ending in digits ranging from 30 to 39
▪ He is in his thirties. ▪ old photographs from the thirties [=from 1930–1939]
— thir·ti·eth /ˈθɚtijəθ/ noun, plural thir·tieths [count]
▪ the thirtieth of November ▪ seven thirtieths of a degree
/ˈθɚtijəθ/ noun, plural thir·tieths [count] ▪ the thirtieth of November ▪ seven thirtieths of a degree
— thirtieth adjective
▪ her thirtieth birthday
▪ her thirtieth birthday
— thirty adjective
▪ thirty days/dollars
▪ thirty days/dollars
— thirty pronoun
▪ thirty of his classmates
▪ thirty of his classmates
— thir·ty·ish /ˈθɚtijɪʃ/ adjective
▪ He was tall, thirtyish [=about 30 years old], and had glasses and brown hair.
/ˈθɚtijɪʃ/ adjective ▪ He was tall, thirtyish [=about 30 years old], and had glasses and brown hair.
