cru·cial

[kroo-shuhl]
adjective
1.
involving an extremely important decision or result; decisive; critical: a crucial experiment.
2.
severe; trying.
3.
of the form of a cross; cross-shaped.

Origin:
1700–10; < Latin cruci- (stem of crux) cross + -al1

cru·ci·al·i·ty [kroo-shee-al-i-tee, kroo-shal-] , noun
cru·cial·ly, adverb
non·cru·cial, adjective
non·cru·cial·ly, adverb
pre·cru·cial, adjective


1. momentous, vital, essential, significant.
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Based on the Random House Dictionary, © Random House, Inc. 2013.
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00:10
Crucial is an LSAT word you need to know.
So is decidable. Does it mean:
having the property that its consistency or inconsistency with the axioms of a given logical system is determinable
to go around or bypass:
Collins
World English Dictionary
crucial (ˈkruːʃəl) [Click for IPA pronunciation guide]
 
adj
1.  involving a final or supremely important decision or event; decisive; critical
2.  informal very important
3.  slang very good
 
[C18: from French, from Latin cruxcross]
 
'crucially
 
adv

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009
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Etymonline
Word Origin & History

crucial
1706, from Fr. crucial, a medical term for ligaments of the knee (which cross each other), from L. crux (gen. crucis) "cross." The meaning "decisive, critical" is extended from a logical term, Instantias Crucis, adopted by Francis Bacon (1620); the notion is of cross fingerboard signposts at forking
roads, thus a requirement to choose.
Online Etymology Dictionary, © 2010 Douglas Harper
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Example sentences
Seeds are crucial to fruit formation because they typically emit hormone
  signals that bring the fruit into being.
The promotion-and-tenure committee had easily approved his third-year
  review-allegedly the crucial hurdle on the path to tenure.
His artful images relay the crucial connection between humanity and nature.
The difficulty is that crucial parts of these surface molecules are hidden from
  the attacking antibodies.
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