essential
noun
anything indispensable
“food and shelter are necessities of life”
“the essentials of the good life”
Oppositesinessential
adjective
absolutely necessary; vitally necessary
“essential tools and materials”
“funds essential to the completion of the project”
Synonymsindispensablebasic and fundamental
“the essential feature”
Oppositesinessentialof the greatest importance
“the all-important subject of disarmament”
“crucial information”
being or relating to or containing the essence of a plant etc
“essential oil”
defining rights and duties as opposed to giving the rules by which rights and duties are established
“substantive law”
Synonymssubstantive
Source: WordNet 3.1, Princeton University
