Formally Renounce can be defined as ABJURE, which is a six letter word. ABJURE means to formally reject or disavow a formerly held belief, usually under pressure. It is often used in legal contexts, such as when a witness in a court of law renounces a statement they have made. It is also used in religious contexts, such as when someone renounces their faith. In either case, it is a formal and serious act.