This is the 200th most frequent Japanese word.
全
Whole; all; entire; complete.
Here, '全て' (subete) is used to mean 'all' or 'every' to indicate the entirety of a group.
全ての生徒がテストに合格しました。
All the students passed the test.
Here '全力で' (zenryoku de) uses '全' to mean 'with full power or effort'.
このプロジェクトは全力で取り組むべきです。
This project should be tackled with all one's might.
Here '全く' (mattaku) uses '全' to express 'completely' or 'entirely'.