The Simple English Wikipedia has an article on: Oath Pronunciation (UK) IPA (key): /ˈəʊθ/ (US) IPA (key): /ˈoʊθ/ Audio (US)(file) Noun Singular oath Plural oaths (countable) An oath is a very serious promise. Synonyms: vow and pledge (countable) An oath is a swear word or curse.Wikiwand - on Seamless Wikipedia browsing. On steroids.Remove ads