This is the 938th most frequent German word.
gesamte
"Gesamte" means "entire" or "whole" in English.
In this sentence, 'gesamte' is used as an adjective modifying 'Klasse', emphasizing that all members of the class are included.
Die gesamte Klasse hat die Hausaufgaben gemacht.
The entire class did the homework.
Here, 'gesamte' describes the noun 'Buch', conveying that the whole book, from start to finish, was read.
Ich habe das gesamte Buch über das Mittelalter gelesen.
I read the entire book about the Middle Ages.
The word 'gesamte' is used to qualify 'Gebiet', indicating that the evacuation applied to the whole area without exceptions.