cru-cial / kro͞o-shəl
1. extremely important
One man can be a crucial ingredient on a team, but one man cannot make a team.
Kareem Abdul Jabbar, 1947 –
2. vital; essential to the determination of a crisis
Self-discipline is crucial to a simpler, more contented life.
Dalai Lama, 1935 –
A French adjective from the Latin noun crux, crucis (cross, torture, misery) and Latin adjectival suffix -alis (belonging to, characteristic of).
Thank you to Allen Ward for providing this etymology.