The act of usurping, especially the wrongful seizure of royal sovereignty.
A wrongful seizure or exercise of authority or privilege belonging to another; an encroachment: "in our own day, gross usurpations upon the liberty of private life” ( John Stuart Mill).
American Heritage(R) Dictionary of the English Language, Fifth Edition. Copyright (c) 2011 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.