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Definition of unofficial - 4 dictionary results
un·of·fi·cial   (ŭn'ə-fĭsh'əl)   
adj.  

  1. Not official: the unofficial election results.

  2. Not acting officially: an unofficial adviser.

un'of·fi'cial·ly adv.
The American Heritage® Dictionary of the English Language, Fourth Edition
Copyright © 2009 by Houghton Mifflin Company.
Published by Houghton Mifflin Company. All rights reserved.
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Word Origin & History

unofficial 
Use unofficial in a Sentence
1798, from un- (1) "not" + official.
Online Etymology Dictionary, © 2001 Douglas Harper
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Medical Dictionary

Main Entry: un·of·fi·cial
Pronunciation: "&n-&-'fish-&l
Function: adjective
: not official; specifically : of, relating to, or being a drug not described in the U.S. Pharmacopeia and National Formulary —compare NONOFFICIAL, OFFICIAL
Merriam-Webster's Medical Dictionary, © 2002 Merriam-Webster, Inc.
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Medical Dictionary

unofficial un·of·fi·cial (ŭn'ə-fĭsh'əl)
adj.
Of or being a drug that is not listed in the United States Pharmacopeia or the National Formulary.

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