See more synonyms for crucial on
  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 of crucial

1700–10; < Latin cruci- (stem of crux) cross + -al1
Related formscru·ci·al·i·ty [kroo-shee-al-i-tee, kroo-shal-] /ˌkru ʃiˈæl ɪ ti, kruˈʃæl-/, nouncru·cial·ly, adverbnon·cru·cial, adjectivenon·cru·cial·ly, adverbpre·cru·cial, adjective

Synonyms for crucial

See more synonyms for on Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018

Related Words for crucially

crucially, essentially, necessarily, imperatively

Examples from the Web for crucially

Contemporary Examples of crucially

Historical Examples of crucially

  • Brockway asked, crucially anxious to know what his friend had been able to do for him.

  • Ford was crucially anxious to find out how the battle was likely to go, and his companion seemed amiably communicative.

    Empire Builders

    Francis Lynde

British Dictionary definitions for crucially


  1. involving a final or supremely important decision or event; decisive; critical
  2. informal very important
  3. slang very good
Derived Formscrucially, adverb

Word Origin for crucial

C18: from French, from Latin crux cross
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012

Word Origin and History for crucially



1706, "cross-shaped," from French crucial, a medical term for ligaments of the knee (which cross each other), from Latin crux (genitive crucis) "cross" (see cross (n.)). The meaning "decisive, critical" (1830) 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