from The American Heritage® Dictionary of the English Language, 5th Edition.

  • adjective Not official.
  • adjective Not acting officially.

from The Century Dictionary.

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

from Wiktionary, Creative Commons Attribution/Share-Alike License.

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

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

  • adjective not having official authority or sanction
  • adjective not officially established


from Wiktionary, Creative Commons Attribution/Share-Alike License

un- +‎ official



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