American English

Definition of unofficial adjective from the Oxford Advanced American Dictionary



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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
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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