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

Similar word(s): critical, critical, decisive, pivotal, polar, decisive, essential, important

2. having crucial relevance

- crucial to the case

Similar word(s): material

3. of the greatest importance

- crucial information

Similar word(s): important, essential

Sentences with crucial as an adjective:

- The battle of Tali-Ihantala in 1944 is one of the crucial moments in the history of Finland.

- A secure supply of crude oil is crucial for any modern nation, let alone a superpower.

- Delbert Wilkins is the most crucial pirate radio DJ in Brixton.