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Essential

Definition: Belonging to the essence, or that which makes an object,
or class of objects, what it is.

Essential

Definition: Hence, really existing; existent.

Essential

Definition: Important in the highest degree; indispensable to the
attainment of an object; indispensably necessary.

Essential

Definition: Containing the essence or characteristic portion of a
substance, as of a plant; highly rectified; pure; hence, unmixed; as,
an essential oil.

Essential

Definition: Necessary; indispensable; -- said of those tones which
constitute a chord, in distinction from ornamental or passing tones.

Essential

Definition: Idiopathic; independent of other diseases.