This is the 367th most frequent Italian word.
nostre
The Italian word "nostre" means "our" (feminine plural).
The word "nostre" is a possessive adjective indicating that the subject 'houses' (case) belongs to the first-person plural (we) group. It agrees in gender (feminine) and number (plural) with 'case'.
Le nostre case sono sulla collina.
Our houses are on the hill.
Here, "nostre" is a possessive adjective that describes the noun 'bicycles' (biciclette) as belonging to the first-person plural group. It's used in its feminine plural form to agree with 'biciclette'.
Abbiamo portato le nostre biciclette al parco.
We brought our bicycles to the park.
"Nostre" in this sentence serves as a possessive adjective modifying 'vacanze' (vacations), denoting possession by the first-person plural group. It matches 'vacanze' in gender (feminine) and number (plural).