1. [Adjective]: applying to essential legal principles and rules of right; "substantive law"

2. [Adjective]: basic and fundamental; "the essential feature"

3. [Adjective]: being or relating to or containing the essence of a plant etc; "essential oil"

4. [Noun]: anything indispensable; "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"

5. absolutely required and not to be used up or sacrificed

6. absolutely necessary; vitally necessary; "essential tools and materials"; "funds essential to the completion of the project"; "an indispensable worker"

7. of the greatest importance; "the all-important subject of disarmament"; "crucial information"; "in chess cool nerves are of the essence"

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