[n] 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"
[adj] (law) applying to essential legal principles and rules of right; "substantive law"
[adj] basic and fundamental; "the essential feature"
[adj] absolutely required and not to be used up or sacrificed
[adj] of the greatest importance; "the all-important subject of disarmament"; "crucial information"; "in chess cool nerves are of the essence"
[adj] absolutely necessary; vitally necessary; "essential tools and materials"; "funds essential to the completion of the project"; "an indispensable worker"
[adj] being or relating to or containing the essence of a plant etc; "essential oil"
all important(p), all-important(a), basal, basic, biogenic, constituent(a), constitutional, constitutive(a), in essence, life-sustaining, must(a), necessary, necessity, no-frills(a), of the essence(p), organic, primary, requirement, requisite, staple, sub