to seize and hold (a position, office, power, etc.) by force or without legal right: The pretender tried to usurp the throne.
to use without authority or right; employ wrongfully: The magazine usurped copyrighted material.
verb (used without object)
to commit forcible or illegal seizure of an office, power, etc.; encroach.
Origin: 1275–1325;Middle English < Latinūsūrpāre to take possession through use, equivalent to ūsū (ablative of ūsususe (noun)) + -rp-, reduced form of -rip-, combining form of rapere to seize + -āre infinitive ending