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English definition of “crucial”

crucial

adjective  /ˈkru·ʃəl/ us  
(of a decision or event) extremely important because many other things depend on it: The behavior of the oceans is a crucial aspect of global warming.
crucially
adverb  /ˈkru·ʃə·li/ us  
The band wants to win over fans and, more crucially, radio programmers.
(Definition of crucial from the Cambridge Academic Content Dictionary © Cambridge University Press)
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