essential

Noun
  1. Anything indispensable (synset 109390100)
    "food and shelter are necessities of life"; "the essentials of the good life"; "allow farmers to buy their requirements under favorable conditions"; "a place where the requisites of water fuel and fodder can be obtained"
Adjective
  1. Absolutely necessary;
    Vitally necessary (synset 301584714)
    "essential tools and materials"; "funds essential to the completion of the project"; "an indispensable worker"
  2. Basic and fundamental (synset 300903909)
    "the essential feature"
  3. Of the greatest importance (synset 301279260)
    "the all-important subject of disarmament"; "crucial information"; "in chess cool nerves are of the essence"
  4. Being or relating to or containing the essence of a plant etc (synset 302733724)
    "essential oil"
  5. Defining rights and duties as opposed to giving the rules by which rights and duties are established (synset 300055779)
    "substantive law"

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