aver

(verb) report or maintain. Synonyms: allege, say. Examples: "He alleged that he was the victim of a crime." "He said it was too late to intervene in the war." "The registrar says that i owe the school money."

(verb) to declare or affirm solemnly and formally as true. Synonyms: affirm, verify, assert, avow, swan, swear. Examples: "Before god i swear i am innocent."