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essential

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adjective essential pronunciation in British English /ɪˈsenʃ(ə)l/
  1. 1
    completely necessary

    In a large organization, good internal communication is essential.

    essential for:

    Light is absolutely essential for the healthy development of plants.

    essential to:

    He had acquired the skills essential to his later success in politics.

    it is essential (that):

    It is essential that all equipment is properly maintained.

    it is essential to do something:

    If you want to make major changes, it is essential to involve your staff.

    essential reading:

    Her articles are essential reading for anyone interested in the war.

    play an essential role/part in something:

    She has always played an essential part in the smooth running of the business.

    Synonyms and related words for this sense of essential
  2. 2
    the essential features of something are its most basic and typical features

    the essential characteristics of Marxist political thought

    The essential difference between us is that I take life seriously.

    1. a.
      most basic and necessary

      essential services such as shops and buses

      food, fuel, and other essential supplies

      Synonyms and related words for this sense of essential
    2. b.
    See also  fundamental

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