noun
the act of wrongfully seizing or taking over something, especially power or authority
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The usurpation of power by the military led to a constitutional crisis.
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The king's brother attempted a usurpation of the throne, but failed miserably.
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I heard there was some shady usurpation going on in the company's management.
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His usurpation of her time and attention left her feeling drained and exhausted.