AVER

to state as a fact; to declare or assert

report or maintain; to declare or affirm solemnly and formally as true

SYN - affirm, assert, avow, swear, swan, verify, allege, say

"what they needed was someone from the cigarette industry to aver that they had illegally marketed to kids."

"This was not one of the things he was wobbling about, he averred the truth and correctness of his stance."

"I would like to once and for all aver that I had nothing at all to do with the alleged conspiracy to overthrow our beloved dictator."