WordReference Random House Learner's Dictionary of American English © 2017
cru•cial /ˈkruʃəl/USA pronunciation   adj. 
  1. of highest, greatest, or most critical importance:a crucial experiment.
cru•cial•ly, adv.: The weather crucially affected the decision to proceed.

WordReference Random House Unabridged Dictionary of American English © 2017
cru•cial  (kro̅o̅shəl),USA pronunciation adj. 
  1. involving an extremely important decision or result; decisive;
    critical:a crucial experiment.
  2. severe;
  3. of the form of a cross;
cru•ci•al•i•ty  (kro̅o̅′shē ali tē, kro̅o̅ shal-),USA pronunciation n.  crucial•ly, adv. 
  • Latin cruci- (stem of crux) cross + -al1
  • 1700–10
    • 1.See corresponding entry in Unabridged momentous, vital, essential, significant.

Collins Concise English Dictionary © HarperCollins Publishers::

crucial /ˈkruːʃəl/ adj
  1. involving a final or supremely important decision or event; decisive; critical
  2. informal very important
  3. slang very good
Etymology: 18th Century: from French, from Latin crux cross

ˈcrucially adv

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