usurper

[ yoo-sur-per, -zur‐ ]
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noun
  1. someone who seizes an office or position of power by force or without legal right, or who is perceived to have done so: The usurper Vitigis gathered his army together and laid siege to Rome.

Origin of usurper

1
First recorded in 1400–50; usurp + -er1

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Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2024

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