This is the 107th most frequent Italian word.
nostro
"Our" (possessive adjective).
In this sentence, 'nostro' is a possessive adjective used to indicate ownership or association, specifying that the project belongs to 'us', a group including the speaker.
Questo è il nostro progetto per la scuola.
This is our project for the school.
Here, 'nostra' agrees in gender and number with 'casa' (feminine singular), emphasizing that the house belongs to 'us'.
La nostra casa si trova vicino al mare.
Our house is located near the sea.
In this example, 'nostro' shows possession, referring to the contribution made by 'us', showing its flexible use with abstract nouns.