Pronunciation: (yOO-sûrp', -zûrp'), [key]
1. to seize and hold (a position, office, power, etc.) by force or without legal right: The pretender tried to usurp the throne.
2. to use without authority or right; employ wrongfully: The magazine usurped copyrighted material.
to commit forcible or illegal seizure of an office, power, etc.; encroach.
Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.