Meaning & Definition of Crucial in English

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"

2. Having crucial relevance

• "Crucial to the case"

• "Relevant testimony"

3. Of the greatest importance

• "The all-important subject of disarmament"

• "Crucial information"

• "In chess cool nerves are of the essence"