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essential

 
/ɪˈsen·ʃəl/ adj

Definition

extremely important or necessary: A knowledge of Spanish is essential for this job. Essential also means basic to the nature of someone or something: There is an essential difference between the two sisters in their approach to life. essentially
 
/ɪˈsen·ʃə·li/ adv [not gradable]
Essentially she’s saying that she is not interested in seeing you again.
(Definition of essential adj from the Cambridge Academic Content Dictionary © Cambridge University Press)

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