crucial

adjective

1. 1

   Essential or decisive for determining the outcome or future of something; extremely important.

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

2. 2

   Cruciform or cruciate; cross-shaped.

3. 3

   (Bermuda) Very good; excellent; particularly applied to reggae music.

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