1. Being essential or decisive for determining the outcome or future of something; extremely important.
    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.
  2. Cruciform or cruciate; cross-shaped.
  3. Term of approval, particularly when applied to reggae music.
    Delbert Wilkins is the most crucial pirate radio DJ in Brixton.

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