as·sev·er·a·tion \ ̷ ̷ˌ ̷ ̷ ̷ ̷ˈrāshən\noun (-s) Etymology: Latin asseveration-, asseveratio, from asseveratus + -ion-, -io -ion : the act of asseverating : positive or emphatic affirmation or assertion : solemn declaration < a simple factual account of the author's asseverations — Muna Lee >