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"
the act of demanding; "the kidnapper's exorbitant demands for money"
an urgent or peremptory request; "his demands for attention were unceasing"
the ability and desire to purchase goods and services; "the automobile reduced the demand for buggywhips"; "the demand exceeded the supply"
request urgently and forcefully; "The victim's family is demanding compensation"; "The boss demanded that he be fired immediately"; "She demanded to see the manager"
claim as due or just; "The bank demanded payment of the loan"