prior - definition and synonyms

adjective formal 

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  1. happening, existing, or done before a particular time
    prior notice/warning/consultation etc:

    Illegally parked cars may be removed at any time without prior notice.

    a prior arrangement/engagement:

    I’m afraid I won’t be able to come. I’ve got a prior engagement.

    prior knowledge/experience:

    students with no prior knowledge of the target language