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    Unauthorized

    /ˌʌn.ɔːˈθɔːr.aɪzd/

    Meaning & Definition

    adjective
    Not having official permission or approval.
    The security system flagged the unauthorized access attempt.
    Carried out or done without permission or authorization.
    He was reprimanded for unauthorized use of the company vehicle.
    Illegitimate or improper due to lack of authorization.
    The unauthorized publication of the report led to a lawsuit.

    Etymology

    The prefix 'un-' means not + 'authorized' from 'authorize', which comes from the Latin 'auctorizare'.

    Common Phrases and Expressions

    unauthorized access
    Gaining entry to a system or place without permission.
    unauthorized use
    Using something without explicit granted permission.

    Related Words

    authorize
    To give official permission.
    permission
    Consent or authorization to do something.
    credential
    A qualification or aspect of a person's background.

    Slang Meanings

    Going rogue
    He was going rogue by working on that project without authorization.
    On the down-low
    She was on the down-low about her unauthorized plans for the event.