Definition of unofficial adjective from the Oxford Advanced Learner's Dictionary



    BrE BrE//ˌʌnəˈfɪʃl//
    ; NAmE NAmE//ˌʌnəˈfɪʃl//
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  1. 1that does not have permission or approval from somebody in authority an unofficial agreement/strike Unofficial estimates put the figure at over two million.
  2. 2that is not part of somebody’s official business The former president paid an unofficial visit to China.
  3. opposite official
    Extra examples According to unofficial estimates about 200 died. It’s one of numerous unofficial Harry Potter websites/​fan clubs. The result for the athlete was an unofficial world best of 2 minutes 27 seconds. There will be a review of the law on unofficial action and strikes in essential services. Unofficial reports indicated that up to 10 million people had been made homeless. Unofficial sources report that four people were killed in the accident
See the Oxford Advanced American Dictionary entry: unofficial