asseverate
/ˌæs.vəˈreɪt, -ˈriːt/Definitions
1. verb
to assert or state something firmly or positively
“The politician asseverated that the economy would improve soon.”
2. verb
to affirm or declare something to be true
“She asseverated her innocence in the face of the accusations.”
3. noun
a statement or assertion made with confidence or firmness
“The lawyer made a strong asseveration of her client’s innocence.”