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adjective British English pronunciation: unknown /ʌnˈnəʊn/
  1. 1
    if something is unknown, people do not know about it or do not know what it is

    Several hundred people were affected by the previously unknown virus.

    be unknown to someone:

    Most of her friends are unknown to me.

    for some unknown reason:

    For some unknown reason, the plane landed at the wrong airport.

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