|an extraordinary or unusual thing, person, or event; an
exceptional example or instance.| |a stew of meat, vegetables,
potatoes, etc.| |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 classifi