This is the 3574th most frequent Polish word.
cała
"Cała" means "whole" or "entire" in English.
In this sentence, 'cała' functions as an adjective modifying 'rodzina' (family), meaning 'whole', emphasizing the entirety of the family.
Cała rodzina zebrała się na święta.
The whole family gathered for the holidays.
Here, 'całą' is the accusative singular feminine form of the adjective 'cały', modifying 'ulicę' (street), indicating the full extent of the street covered in movement.
Przeszła przez całą ulicę, aby dotrzeć do sklepu.
She walked across the entire street to reach the store.
In this instance, 'całą' again serves as the accusative singular feminine form of 'cały', describing 'pizzę' (pizza), expressing the entirety of the pizza consumed.