Definition of unofficial adjective from the Oxford Advanced American Dictionary

     

    unofficial

     adjective
    adjective
    NAmE//ˌʌnəˈfɪʃl//
     
     
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  1. 1that does not have permission or approval from someone in authority an unofficial agreement/strike Unofficial estimates put the figure at over two million.
  2. 2that is not part of someone's official business The former president paid an unofficial visit to China. opposite official
unofficially
 
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NAmE//ˌʌnəˈfɪʃəli//
 
adverb Costs were unofficially estimated at about $6,000. He had already been doing the job unofficially, and now he would be paid for it.
See the Oxford Advanced Learner's Dictionary entry: unofficial