This is the 15239th most frequent Polish word.
siedemnaście
Seventeen.
Here, 'siedemnaście' is used as a cardinal number to indicate quantity.
W klasie jest siedemnaście uczniów.
There are seventeen students in the classroom.
In this case, 'siedemnaście' denotes age, serving as a cardinal number related to time.
On skończył siedemnaście lat w czerwcu.
He turned seventeen years old in June.
Here, 'siedemnaście' again functions as a cardinal number to express a specific amount.