D defs.my
Entry 1 sense Webster, 1913

Asseveration

· As·sev·er·a·tion · IPA /əˌsɛv.əˈɹeɪ.ʃən/
01 n. The act of asseverating, or that which is asseverated; positive affirmation or assertion; solemn declaration.
  1. 1.
    The act of asseverating, or that which is asseverated; positive affirmation or assertion; solemn declaration.
    “Another abuse of the tongue I might add, -- vehement asseverations upon slight and trivial occasions.” Ray.