|1.||vitally important; absolutely necessary|
|2.||basic; fundamental: the essential feature|
|3.||completely realized; absolute; perfect: essential beauty|
|4.||biochem (of an amino acid or a fatty acid) necessary for the normal growth of an organism but not synthesized by the organism and therefore required in the diet|
|5.||derived from or relating to an extract of a plant, drug, etc: an essential oil|
|6.||logic (of a property) guaranteed by the identity of the subject; necessary. Thus, if having the atomic number 79 is an essential property of gold, nothing can be gold unless it has that atomic number|
|7.||music denoting or relating to a note that belongs to the fundamental harmony of a chord or piece|
|8.||pathol (of a disease) having no obvious external cause: essential hypertension|
|9.||geology (of a mineral constituent of a rock) necessary for defining the classification of a rock. Its absence alters the rock's name and classification|
|10.||something fundamental or indispensable: a sharp eye is an essential for a printer|
|11.||music an essential note|
essential es·sen·tial (ĭ-sěn'shəl)
Constituting or being part of the essence of something; inherent.
Basic or indispensable; necessary.
Of, relating to, or being a dysfunctional condition or a disease whose cause is unknown.
Of, relating to, or being a substance that is required for normal functioning but cannot be synthesized by the body and therefore must be included in the diet.
Something necessary or indispensable.