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Definition of essential:

  1. Belonging to the essence, or that which makes an object, or class of objects, what it is.
  2. Containing the essence or characteristic portion of a substance, as of a plant; highly rectified; pure; hence, unmixed; as, an essential oil.
  3. Hence, really existing; existent.
  4. Idiopathic; independent of other diseases.
  5. Important in the highest degree; indispensable to the attainment of an object; indispensably necessary.
  6. Necessary; indispensable; - said of those tones which constitute a chord, in distinction from ornamental or passing tones.


native, be, constitutive, staple, constituent, inborn, inwrought, basic, innate, primitive, substantive, inbred, inherent, inhering, integral, necessary, organic, inseparable, basal, biogenic, in essence, underlying, ingrained, of the essence, primary, natural, quintessential, requisite, vital, intrinsic, congenital, indwelling, substantial, must, surface, requirement, virtual, all-important, ultimate, internal, infixed, demand, subjective, constitutional, life-sustaining, no-frills, necessity, needful, immanent, meaty, important, crucial.

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