This is the 310th most frequent Russian word.
нашего
"Of our" or "ours" (possessive form).
Possessive adjective 'нашего' is used in the genitive singular masculine form, indicating ownership and modifying the noun 'друга' (friend).
Мы встретили нашего друга в парке.
We met our friend in the park.
Possessive adjective 'нашего' is in the accusative singular masculine form, corresponding to the direct object 'котёнка' (kitten).
Кто видел нашего котёнка?
Who saw our kitten?
Possessive adjective 'нашего' is in the genitive singular masculine form, associated with 'коллектива' (team) in a prepositional phrase.