Of the greatest importance; crucial.
Vital to the resolution of a crisis or the determination of an outcome:
The definition of essential is completely necessary or part of the basic nature of something.
Find another word for all-important. In this page you can discover 7 synonyms, antonyms, idiomatic expressions, and related words for all-important, like: all-important, crucial, essential, of-the-essence, seven-under-par, finger-ring and Arjo.