essential - definition and synonyms

noun 

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/ɪˈsenʃ(ə)l/
singularessential
pluralessentials
  1. 1
    [countable] [usually plural] something that is needed for life, or needed in a particular situation

    food, water, and other essentials

    She packed a few essentials and headed for the airport.

    the bare/barest essentials:

    Millions of people lack even the bare essentials.

  2. 2

    essentials

    [plural] the most basic and important aspects of a subject
    essential of:

    He agreed to teach me the essentials of web page design.