This is the 894th most frequent Polish word.
całe
"Całe" means "whole" or "entire" in English.
In this sentence, "całe" is used as an adjective modifying the noun "ciasto" (cake), indicating its entirety.
Całe ciasto zostało zjedzone.
The whole cake has been eaten.
Here, "całe" is an adjective modifying "miasto" (town), signifying the entire entity as a collective.
Całe miasto zebrało się na festiwal.
The entire town gathered for the festival.
In this case, "całą" (feminine form of "całe") is used to modify "scenę" (scene), again denoting entirety.