Usually means: Betrayer of one's own country.
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We found 7 dictionaries that define the word treasonist:

General (7 matching dictionaries)
  1. treasonist: Wiktionary
  2. treasonist: Dictionary.com
  3. treasonist: Rhymezone
  4. treasonist: FreeDictionary.org
  5. treasonist: Mnemonic Dictionary
  6. treasonist: TheFreeDictionary.com
  7. treasonist: Vocabulary.com

(Note: See treasonists as well.)

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Definitions from Wiktionary (treasonist)

▸ noun:  One who commits treason.

Similar:
traitor, betrayee, collaborator, stealer, defector, thief, tyrannizer, contravener, threatener, infiltree, more...

Opposite:
loyalist, patriot, supporter

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▸ Rhymes of treasonist

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Similar:
traitor, betrayee, collaborator, stealer, defector, thief, tyrannizer, contravener, threatener, infiltree, more...

Opposite:
loyalist, patriot, supporter



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