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English definition of “essential”

essential

adjective     /ɪˈsen.ʃəl/
B1 necessary or needed: Government support will be essential if the project is to succeed. There is essential work to be done before the building can be re-occupied. Water is essential for/to living things. It is essential (that) our prices remain competitive. [+ to infinitive] For the experiment to be valid, it is essential to record the data accurately.Essential or necessary
(Definition of essential adjective from the Cambridge Advanced Learner's Dictionary & Thesaurus © Cambridge University Press)
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