Ex Patriate Definition: A person who has abandoned his or her country of origin and citizenship and has become a subject or citizen of another country. Related Terms: Expatriation The name given to an individual who has renounced his or her previous citizenship.My neighbor recently gave up his American citizenship and became a Canadian citizen; he is thus an ex patriate of the United States of America.See Legal Definition of Expatriation.REFERENCES:Gura, Alan, Ex-Patriates and Patriots: A Constitutional Examination of the Uniformed and Overseas Citizens Absentee Voting Act, 6 TROLP 179 (2001) Categories & Topics: Dictionary of Latin Law Terms Immigration Law Dictionary International Law Dictionary Find you are constantly looking up definitions? Try our search provider (works in most modern browsers) If you find an error or omission in Duhaime's Legal Dictionary, or if you have legal term suggestion, we'd love to hear from you!