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QED /ˌkjuːˌiːˈdiː/  

  • abbreviation
    used to say that something (such as a particular fact or a logical statement) proves what you were trying to prove;
    QED is an abbreviation of the Latin phrase quod erat demonstrandum, ˌkwɑːdˈeɚˌɑːtˌdɛmənˈstrændəm which means which was to be demonstrated.