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

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

Antonym: noncrucial

Encyclopedia: Crucial

• lower court
• lower criticism
• lower deck
• Lower Egypt
• lower jaw
• lower jawbone
• lower limit
• lower mantle
• lower oneself
• Lower Paleolithic
• Lower Peninsula
• lower rank
• lower respiratory infection
• lower respiratory tract
• lower respiratory tract smear
• Lower Saxony
• lower status
• Lower Tunguska
• lower-case letter
• lower-middle-class
• Lower-Normandy
• lower-ranking
• lowercase
• lowerclassman
• lowered