Essential
From BiblePortal Wikipedia
Essential [1]
(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.
