category
US /ˈkæt̬.ə.ɡri/
UK /ˈkæt̬.ə.ɡri/

1.
categoria, classe
a class or division of people or things regarded as having particular shared characteristics
:
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The books are organized into different categories.
I libri sono organizzati in diverse categorie.
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Which age category do you belong to?
A quale categoria di età appartieni?