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

• first degree
• first derivative
• First Duke of Marlborough
• First Duke of Wellington
• First Earl Kitchener of Khartoum
• First Earl of Beaconsfield
• First Earl of Chatham
• First Earl of Orford
• First Earl Wavell
• First Epistle of John
• First Epistle of Paul the Apostle to the Corinthians
• First Epistle of Paul the Apostle to the Thessalonians
• First Epistle of Paul the Apostle to Timothy
• First Epistle of Peter
• First Epistle to the Corinthians
• First Epistle to the Thessalonians
• First Epistle to Timothy
• first estate
• first floor
• first fruits
• first gear
• first half
• first harmonic
• first in first out
• first lady