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essential

[
US
ɪˈsenʃl ]
[
UK
ɪˈsenʃl ]
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TOEIC 650

Adjective

1. Absolutely necessary; extremely important.

it is essential to keep up-to-date records

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2. Fundamental or central to the nature of something or someone.

The love of beauty is an essential part of human nature.

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3. (of an amino acid or fatty acid) required for normal growth but not synthesized in the body and therefore necessary in the diet.

Key essential amino acids are valine, leucine, isoleucine, tryptophan and methionine.

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4. (of a disease) with no known external stimulus or cause; idiopathic.

He also had chronic obstructive airways disease and essential hypertension.

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Noun

1. A thing that is absolutely necessary.

She bought a few essentials and some sweets for the children.

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2. (essentials) The fundamental elements or characteristics of something.

He himself had grasped the essentials of Jewish teaching.

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Origin

1. Middle English (in the sense ‘in the highest degree’): from late Latin essentialis, from Latin essentia (see essence).

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