usurp verb \yu̇-ˈsərp also -ˈzərp\: to take and keep (something, such as power) in a forceful or violent way and especially without the right to do so.
1 a: to seize and hold (as office, place, or powers) in possession by force or without right <usurp a throne>. b: to take or make use of without right <usurped the rights to her life story>. 2: to take the place of by or as if by force : supplant <must not let stock responses based on inherited prejudice usurp careful judgment>.
Definition source: http://www.merriam-webster.com
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