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Adjective: crucial  kroo-shul
  1. Of extreme importance; vital to the resolution of a crisis
    "a crucial moment in his career";
    - important
  2. Having essential relevance
    "crucial to the case"
  3. Of the greatest importance
    "crucial information";
    - all-important, all important, essential, of the essence

See also: climacteric, critical, decisive, essential, important, life-and-death, life-or-death, material, of import, pivotal, polar

Antonym: noncrucial

Encyclopedia: Crucial