nonessential
American Heritage Dictionary:
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non·es·sen·tial
(nŏn'ĭ-sĕn'shəl) 
adj.
adj.
- Having little or no importance; not essential.
- Biochemistry. Being a substance that is required for normal functioning but does not need to be included in the diet because of the body's ability to synthesize it from other nutrients.
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nonessential
Roget's Thesaurus:
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nonessential
adjective
- Not necessary: dispensable, inessential, needless, uncalled-for, unessential, unnecessary, unneeded, unrequired. See necessary/unnecessary.
Antonyms by Answers.com:
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nonessential
adj
Definition: not needed or important
Antonyms: essential, important, indispensable, necessary, needed
American Heritage Stedman's Medical Dictionary:
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non·es·sen·tial
(nŏn'ĭ-sĕn'shəl)
adj.
adj.
Being a substance required for normal functioning but not needed in the diet because the body can synthesize it.
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Copyrights:
American Heritage Dictionary
The American Heritage® Dictionary of the English Language, Fourth Edition Copyright © 2007, 2000 by Houghton Mifflin Company. Updated in 2009. Published by Houghton Mifflin Company. All rights reserved.
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Roget's Thesaurus
Roget's II: The New Thesaurus, Third Edition by the Editors of the American Heritage® Dictionary Copyright © 1995 byHoughton Mifflin Company. Published by Houghton Mifflin Company. All rights reserved.
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