meaning of usurpation
1. The act of usurping, or of seizing and enjoying; an authorized, arbitrary assumption and exercise of power, especially an infringing on the rights of others; specifically, the illegal seizure of sovereign power; -- commonly used with of, also used with on or upon; as, the usurpation of a throne; the usurpation of the supreme power.
2. Use; usage; custom.
3. wrongfully seizing and holding an office or powers by force especially the seizure of a throne or supreme authority; "a succession of generals who ruled by
">usurpation"