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nonessential

[non-uh-sen-shuh l]
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adjective
  1. not essential; not necessary: Nonessential use of gasoline was forbidden during the war.
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noun
  1. a nonessential thing or person.
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Origin of nonessential

First recorded in 1745–55; non- + essential

Synonyms

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1. unnecessary, incidental, extrinsic.
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018

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British Dictionary definitions for non-essential

nonessential

adjective
  1. not essential; not necessary
  2. biochem (of an amino acid in a particular organism) able to be synthesized from other substances
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noun
  1. a nonessential person or thing
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Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012

Word Origin and History for non-essential

adj.

also nonessential, 1717, from non- + essential (adj.). Attested as a noun from 1806.

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Online Etymology Dictionary, © 2010 Douglas Harper

non-essential in Medicine

nonessential

(nŏn′ĭ-sĕnshəl)
adj.
  1. Being a substance required for normal functioning but not needed in the diet because the body can synthesize it.
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The American Heritage® Stedman's Medical Dictionary Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.