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