Definition of crucial
1a
: important, significant
… what use we make of them will be the crucial question.— Stanley Kubrick Vitamins are crucial for maintaining good health.
b
: important or essential as resolving a crisis : decisive
She played a crucial role in the negotiations.
c
: marked by final determination of a doubtful issue
the crucial game of a series
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Merriam-Webster unabridged
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Time Traveler for crucial
The first known use of crucial was in 1706
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