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Dictionary


es•sen•tial



Pronunciation: (u-sen'shul), [key]
adj.
1. absolutely necessary; indispensable: Discipline is essential in an army.
2. pertaining to or constituting the essence of a thing.
3. noting or containing an essence of a plant, drug, etc.
4. being such by its very nature or in the highest sense; natural; spontaneous: essential happiness.
5. Math.
a. (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.
b. (of a discontinuity) noting that the function is discontinuous and has no limit at the point. Cf. removable (def. 2).

n.
a basic, indispensable, or necessary element; chief point: Concentrate on essentials rather than details.

Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.

Esseneessential amino acid
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