Definition of TRAITOR TRAITOR Noun Traitor is a noun that refers to an individual who betrays or acts against their own country, group, or allegiance, often by providing aid or information to an enemy or rival. It implies a breach of loyalty or trust. As a Noun (Betrayer of Country): As a noun, traitor describes a person who betrays their own country or government, often by collaborating with an enemy. For example, “The general was accused of being a traitor for leaking military secrets to ... TRAITOR meaning : 1. a person who is not loyal or stops being loyal to their own country, social class, beliefs…. Learn more. A traitor is a person who is not loyal or stops being loyal to their own country, social class, beliefs, etc. Learn more about the meaning , synonyms, and usage of the word traitor with examples from the Cambridge English Corpus. Definition of traitor noun in Oxford Advanced Learner's Dictionary. Meaning , pronunciation, picture, example sentences, grammar, usage notes, synonyms and more.