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

      

    essential

     noun
    noun
    BrE BrE//ɪˈsenʃl//
     
    ; NAmE NAmE//ɪˈsenʃl//
     
    [usually plural]
     
    jump to other results
  1. 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. 2  an important basic fact or piece of knowledge about a subject the essentials of English grammar
  3. Word Origin Middle English (in the sense ‘in the highest degree’): from late Latin essentialis, from Latin essentia, from esse ‘be’.
See the Oxford Advanced American Dictionary entry: essential