Pronunciation (US) enPR: trā′tər, IPA (key): /ˈtreɪtɚ/ or [ˈtʰreɪɾɚ] (UK) IPA (key): /ˈtreɪtə(r)/ Audio (US)(file) Noun Singular traitor Plural traitors (countable) A traitor is a person who betrays someone or something. Wikiwand - on Seamless Wikipedia browsing. On steroids.Remove ads