unofficial definition by American Heritage Dictionary
The American Heritage® Dictionary of the English Language, 4th edition Copyright © 2010 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.
- Not official: the unofficial election results.
- Not acting officially: an unofficial adviser.
- unˌof·fiˈcial·ly adverb
unofficial - Medical Definition
Of or being a drug that is not listed in the United States Pharmacopeia or the National Formulary.