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The intrinsic or indispensable properties that serve to characterize or identify something.
(noun)
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The most important ingredient; the crucial element.
(noun)
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The inherent, unchanging nature of a thing or class of things.
(noun)
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An extract that has the fundamental properties of a substance in concentrated form.
(noun)
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Such an extract in a solution of alcohol.
(noun)
American Heritage(R) Dictionary of the English Language, Fifth Edition. Copyright (c) 2011 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.