Noah Webster's Dictionary 1. (a.) Belonging to the essence, or that which makes an object, or class of objects, what it is. 2. (a.) Hence, really existing; existent. 3. (a.) Important in the highest degree; indispensable to the attainment of an object; indispensably necessary. 4. (a.) Containing the essence or characteristic portion of a substance, as of a plant; highly rectified; pure; hence, unmixed; as, an essential oil. 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.

Multi-Version Concordance Essential (2 Occurrences) Acts 27:34 I therefore strongly advise you to take some food. This is essential for your safety. For not a hair will perish from the head of any one of you." (WEY) Romans 2:18 and know his will, and approve the things that are excellent, being instructed out of the law, (See NAS)