Fromperduellis(“enemy”) +‎-iō.

perduelliō f (genitiveperduelliōnis);third declension

1. treason

Third-declension noun.

• “perduellio”, inCharlton T. Lewis and Charles Short (1879)A Latin Dictionary, Oxford: Clarendon Press
• “perduellio”, inCharlton T. Lewis (1891)An Elementary Latin Dictionary, New York: Harper & Brothers
• perduellio inGaffiot, Félix (1934)Dictionnaire illustré latin-français, Hachette.
• Carl Meißner, Henry William Auden (1894)Latin Phrase-Book‎^[1], London:Macmillan and Co.
  • to charge a person with treason (hostile conduct against the state generally):accusare aliquem perduellionis
    
• “perduellio”, inHarry Thurston Peck, editor (1898),Harper's Dictionary of Classical Antiquities, New York: Harper & Brothers
• “perduellio”, inWilliam Smith et al., editor (1890),A Dictionary of Greek and Roman Antiquities, London: William Wayte. G. E. Marindin

• Latin terms suffixed with -io (abstract noun)
• Latin lemmas
• Latin nouns
• Latin third declension nouns
• Latin feminine nouns in the third declension
• Latin feminine nouns
• Latin words in Meissner and Auden's phrasebook
• la:Crime

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