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English definition of “essential”

essential

adjective    /ɪˈsen·ʃəl/
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/ adverb [not gradable] Essentially she’s saying that she is not interested in seeing you again.
(Definition of essential adjective from the Cambridge Academic Content Dictionary © Cambridge University Press)
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