Entire, Whole
Adverb and Noun
ぜんぶ
全部ですか。
All of it?
わたしのベーコンクッキーを一はこ全部食べちゃったのはだれ！？
Who ate the whole box of my bacon cookies?
この靴下、全部穴があいていますよ。
These socks are all holes.
If you take all parts and put them together, you have all things. The entire collection. It is whole.
This is a jukugo word that uses the on'yomi readings of the kanji. You should be able to read this on your own.