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Definition of essential noun from the Oxford Advanced Learner's Dictionary

essential

noun
 
/ɪˈsenʃl/
 
/ɪˈsenʃl/
[usually plural]
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  1. something that is needed in a particular situation or in order to do a particular thing
    • I only had time to pack the bare essentials (= the most necessary things).
    • The studio had all the essentials like heating and running water.
    • The relief agencies are trying to provide food and other basic essentials.
  2. an important basic fact or piece of knowledge about a subject
    • the essentials of English grammar
  3. Word OriginMiddle English (in the sense ‘in the highest degree’): from late Latin essentialis, from Latin essentia, from esse ‘be’.
See essential in the Oxford Advanced American DictionarySee essential in the Oxford Learner's Dictionary of Academic English
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