crucial
adjective
(of a decision or event in
the future) extremely important
This will be a crucial decision for the
education services because it sets the standard for all future years.
Wilson's evidence proved crucial to the legal
case.
It is crucial that the problem is tackled
immediately.
(British slang) If you
describe something as crucial, you mean that it is very good.
I've bought some crucial new trainers.
crucially
adverb
This case will be crucially (=extremely)
important for other people who have suffered mental and physical damage from the
drug.