the doctrine that kings derive their right to rule directly from God and are not accountable to their subjects; rebellion is the worst of political crimes; "the doctrine of the divine right of kings was enunciated by the Stuarts in Britain in the 16th century"
absolutely required and not to be used up or sacrificed
absolutely necessary; vitally necessary; "essential tools and materials"; "funds essential to the completion of the project"; "an indispensable worker"
being or relating to or containing the essence of a plant etc; "essential oil"