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nonessential

[non-uh-sen-shuh l] /ˌnɒn əˈsɛn ʃəl/
adjective
1.
not essential; not necessary:
Nonessential use of gasoline was forbidden during the war.
noun
2.
a nonessential thing or person.
Origin
1745-1755
1745-55; non- + essential
Synonyms
1. unnecessary, incidental, extrinsic.
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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British Dictionary definitions for non-essential

nonessential

/ˌnɒnɪˈsɛnʃəl/
adjective
1.
not essential; not necessary
2.
(biochem) (of an amino acid in a particular organism) able to be synthesized from other substances
noun
3.
a nonessential person or thing
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
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Word Origin and History for non-essential
adj.

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

Online Etymology Dictionary, © 2010 Douglas Harper
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non-essential in Medicine

nonessential non·es·sen·tial (nŏn'ĭ-sěn'shəl)
adj.
Being a substance required for normal functioning but not needed in the diet because the body can synthesize it.

The American Heritage® Stedman's Medical Dictionary
Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.
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