This is the 1879th most frequent Polish word.
nasza
"Nasza" means "our" in English (feminine form).
Here, 'nasza' serves as a possessive adjective describing ownership of the singular feminine noun 'drużyna', meaning 'team'.
Nasza drużyna wygrała mecz.
Our team won the match.
In this sentence, 'nasza' is a possessive adjective indicating possession of 'babcia' (grandmother), used in relation to requesting permission to visit her.
Czy możemy odwiedzić nasza babcię?
Can we visit our grandmother?
The word 'nasza' is used as a possessive adjective to denote ownership ('our') in relation to a singular feminine noun, 'książka'.