“Quod erat demonstrandum” is a Latin phrase often abbreviated as “Q.E.D.” It translates to “which was to be demonstrated” or “that which was to be demonstrated.” It can be applied figuratively to signify the conclusion of a legal argument or the resolution of a legal matter.
For example, in a legal brief or argument, a lawyer might conclude by stating that a particular point has been proven or demonstrated, and then use “quod erat demonstrandum” to signify the conclusion of that argument.