imperative - definition and synonyms

adjective 

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/ɪmˈperətɪv/
  1. 1
    formal extremely important and urgent

    Long-term investing is risky, and careful planning is imperative.

    it is imperative (that):

    It is imperative that these claims are dealt with quickly.

    it is imperative to do something:

    It was imperative to maintain peace and stability in the region.

     Synonyms and related words
  2. 2
    formal an imperative voice or way of speaking is confident and determined and shows that you expect to be obeyed
  3. 3
    linguistics the imperative form of a verb expresses an order to do something