thirty

As a numeral thirty

is the cardinal number occurring after twenty-nine and before thirty-one, represented in arabic numerals as.

As a noun thirty

is (slang) a rack of thirty beers.

As an adjective thirtypenny is

having a value or cost of thirty pence.

As a numeral thirty

is the cardinal number occurring after twenty-nine and before thirty-one, represented in Arabic numerals as 30.

As a noun thirty

is a rack of thirty beers.

As an adjective thirtyish is

approximately thirty.