English Dictionary

Belonging to the essence, or that which makes an object, or class of objects, what it is.
Source : opted (54055)  - auto

Hence, really existing; existent.
Source : opted (54056)  - auto

Important in the highest degree; indispensable to the attainment of an object; indispensably necessary.
Source : opted (54057)  - auto

Containing the essence or characteristic portion of a substance, as of a plant; highly rectified; pure; hence, unmixed; as, an essential oil.
Source : opted (54058)  - auto

Necessary; indispensable; -- said of those tones which constitute a chord, in distinction from ornamental or passing tones.
Source : opted (54059)  - auto

Idiopathic; independent of other diseases.
Source : opted (54060)  - auto