from The American Heritage® Dictionary of the English Language, 4th Edition

  • adj. Not official: the unofficial election results.
  • adj. Not acting officially: an unofficial adviser.

from Wiktionary, Creative Commons Attribution/Share-Alike License

  • adj. Not officially established.
  • adj. Not acting with official authority.
  • adj. Not listed in a national pharmacopeia &c.

from The Century Dictionary and Cyclopedia

  • Not official; specifically, in medicine, not approved by an authoritative body.

from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.

  • adj. not having official authority or sanction
  • adj. not officially established


un- +‎ official (Wiktionary)



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