not essential; not necessary: Nonessential use of gasoline was forbidden during the war.
a nonessential thing or person.

1745–55; non- + essential

1. unnecessary, incidental, extrinsic. Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
nonessential (ˌnɒnɪˈsɛnʃəl)
1.  not essential; not necessary
2.  biochem (of an amino acid in a particular organism) able to be synthesized from other substances
3.  a nonessential person or thing

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009
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American Heritage
Medical Dictionary

nonessential non·es·sen·tial (nŏn'ĭ-sěn'shəl)
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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