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crucial

adjective
 
 
/ˈkruː.ʃəl/

Definition

B2 extremely important or necessary: a crucial decision/question Her work has been crucial to the project's success. [+ that] It is crucial that the problem is tackled immediately.Very important or urgent crucially
 
 
/-i/ adverb
Very important or urgent
(Definition of crucial adjective from the Cambridge Advanced Learner's Dictionary & Thesaurus © Cambridge University Press)

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