All 4 Uses

crucial
in
Native Speaker
(Auto-generated)

Maybe it was the kind of light that emanated from him, or the way his figure bent the light to a crucial incidence, but from any distance at all he appeared to me as though he were ascending an invisible ramp that magically preceded him.†

crucial = very important
The press was there in force, but I sensed that they understood, too, that the occasion wasn't particularly momentous or crucial to the disposition of actual events, the real violence and tension, even if they would portray it as such on the evening programs.†
Inconsistencies began to arise in crucial details, all of which I inexplicably confused and alternated.†
*
And where he began to think of America as a part of him, maybe even his, and this for me was the crucial leap of his character, deep flaw or not, the leap of his identity no one in our work would find valuable but me.†

Definitions:

(1) (crucial)
very important or necessary -- often because it determines how something else will turn out
(2) (meaning too rare to warrant focus)