"crucial" in the adjective sense

1. crucial, important

of extreme importance vital to the resolution of a crisis

"a crucial moment in his career"

"a crucial election"

"a crucial issue for women"

2. crucial

having crucial relevance

"crucial to the case"

"relevant testimony"

3. all-important, all important, crucial, essential, of the essence

of the greatest importance

"the all-important subject of disarmament"

"crucial information"

"in chess cool nerves are of the essence"

Source: WordNet® (An amazing lexical database of English)

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