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unofficial /ˌʌnəˈfɪʃəl/  

  • adjective
    not official: such as
    not formally chosen by an official decision or vote
    The song is the college's unofficial anthem.
    She was the group's unofficial leader.
    not done or made in a formal way by someone in a position of authority
    Unofficial estimates of the number of people killed in the earthquake range from 3,000 to 5,000.
    I am including an unofficial translation of the speech.
    not having the authority to make a statement, decision, etc.
    not done in a public and formal way as part of someone's job
    The mayor paid an unofficial visit to the hospital.