absolutely necessary; indispensable:Discipline is essential in an army.
pertaining to or constituting the essence of a thing.
noting or containing an essence of a plant, drug, etc.
being such by its very nature or in the highest sense; natural; spontaneous:essential happiness.
(of a singularity of a function of a complex variable) noting that the Laurent series at the point has an infinite number of terms with negative powers.
(of a discontinuity) noting that the function is discontinuous and has no limit at the point. Cf. removable (def. 2).
a basic, indispensable, or necessary element; chief point:Concentrate on essentials rather than details.
Medieval Latin essenciālis for Late Latin essentiālis. See essence, -al1
Middle English essencial 1300–50
1.See corresponding entry in Unabridged fundamental, basic, inherent, intrinsic, vital. See necessary.
2.See corresponding entry in UnabridgedEssential,inherent,intrinsic refer to that which is in the natural composition of a thing. Essential suggests that which is in the very essence or constitution of a thing:Oxygen and hydrogen are essential in water.Inherent means inborn or fixed from the beginning as a permanent quality or constituent of a thing:properties inherent in iron.Intrinsic implies belonging to the nature of a thing itself, and comprised within it, without regard to external considerations or accidentally added properties:the intrinsic value of diamonds.
2.See corresponding entry in Unabridged incidental, extraneous, extrinsic; accidental.