nonessential

[non-uh-sen-shuhl]
adjective
1.
not essential; not necessary: Nonessential use of gasoline was forbidden during the war.
noun
2.
a nonessential thing or person.

Origin:
1745–55; non- + essential


1. unnecessary, incidental, extrinsic.
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World English Dictionary
nonessential (ˌnɒnɪˈsɛnʃəl)
 
adj
1.  not essential; not necessary
2.  biochem (of an amino acid in a particular organism) able to be synthesized from other substances
 
n
3.  a nonessential person or thing

Collins English Dictionary - Complete & Unabridged 10th Edition
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American Heritage
Medical Dictionary

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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Example sentences
The utility went so far as to call individual customers, pleading with them to
  turn off nonessential appliances.
It is a melancholy truth that time lost to nonsensical or nonessential
  committees is gone forever.
What matters are a few nonessential people, and what they do is mostly stare
  into and manipulate screens.
All workable national-health-insurance schemes depend on controlling access to
  nonessential services.
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