de⋅nun⋅ci⋅a⋅tion Pronunciation [di-nuhn-see-ey-shuhn, -shee-] –noun 1. an act or instance of denouncing; public censure or condemnation. 2. an accusation of crime before a public prosecutor or tribunal. 3. notice of the termination or the renouncement of an international agreement or part thereof. 4. Archaic. warning of impending evil; threat.