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essential

 
 
/ɪˈsenʃəl/ adjective

Definition

NECESSARY very important and necessary: Computers are an essential part of our lives. Fibre is essential for a healthy digestive system. [+ to do sth] It is essential to arrive early for the show. [+ (that)] It is absolutely essential that she gets this message.
BASIC the most basic and important: There's one essential point I think you've forgotten.
(Definition of essential adjective from the Cambridge Learner's Dictionary © Cambridge University Press)

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