Longman Dictionary of Contemporary English homepage

unofficial

 adjective
     
un‧of‧fi‧cial
1 done or produced without formal approval or permission:
Hodges wrote an unofficial biography of the artist.
2 not done as part of your job:
The President made an unofficial visit to the Senator's house.
—unofficially adverb
Definition from the Longman Dictionary of Contemporary English
Advanced Learner's Dictionary.

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