unofficial

/ (ˌʌnəˈfɪʃəl) /

adjective

not official or formalan unofficial engagement
not confirmed officiallyan unofficial report
(of a strike) not approved by the strikers' trade union
(of a medicinal drug) not listed in a pharmacopoeia

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Derived forms of unofficial

unofficially, adverb
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

Example sentences from the Web for unofficial

Medical definitions for unofficial

unofficial
[ ŭn′ə-fĭshəl ]

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.