This is the 6470th most frequent Dutch word.
twaalf
"Twaalf" means "twelve" in English.
In this sentence, 'twaalf' is used as a cardinal numeral indicating the quantity of months.
Er zijn twaalf maanden in een jaar.
There are twelve months in a year.
Here, 'twaalf' serves as a modifier to specify the quantity of books read.
Hij heeft twaalf boeken gelezen.
He has read twelve books.
In this context, 'twaalf' is utilized to describe the frequency of the action performed by the clock.