Pro Se Definition: Latin: on one’s own behalf. To appear for one's self in legal proceedings and in Court (at trial) without a lawyer. To be self-represented; direct personal conduct of litigation, as in a pro se litigant. REFERENCES: Duhaime, Lloyd, Legal Definition of Sixth Amendment Duhaime, Lloyd, Legal Definition of Pro Socio. Faretta v California 422 US 806 (1975) Categories & Topics: Civil Litigation & Evidence Law Dictionary Dictionary of Latin Law Terms 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!