Usurper

//juˈsɜɹ.pəɹ// noun

Definitions

Noun
  1. 1
    One who usurps.

    "The fact that the Yongle emperor was therefore a usurper, regicide and nepoticide (nephew-killer) made compiling the Veritable Record – or official history – of his reign a most dangerous scholarly post. The official given this ticklish task managed to survive several drafts, finally producing one that pleased his master as it omitted the dead nephew's reign altogether."

  2. 2
    one who wrongfully or illegally seizes and holds the place of another wordnet

Etymology

From Middle English usurper, usurpour, usurpur, from Middle French usurpeur; equivalent to usurp + -er.

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