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essential(Inherent), adjective basal, basic, basilar, basilary, elemental, fundamental, immanent, implicit, intrinsic, intrinsical, main, primary
essential(Required), adjective basic, binding, called for, chief, compulsory, critical, crucial, demanded, exigent, fundamental, important, incumbent upon, indispensable, lacking, mandatory, material, necessary, needed, needful, obligatory, of vital importance, pressing, primary, proprius, requisite, urgent, verus
Associated concepts: essential duties, essential governmennal duties, essential parties, essential services, essential terms of a contract
See also: actual, basic, cardinal, critical, crucial, exigent, fundamental, grave, imperative, important, indispensable, ingrained, inherent, innate, integral, major, mandatory, material, native, necessary, necessity, obligatory, peremptory, primary, principal, requirement, requisite, resource, rudimentary, substantive, ultimate, underlying, urgent, virtual, vital