The definition of affirm is to state something to be true.
The definition of assert is to make a claim or defense.
To corroborate or confirm; vouch for:
To state as a fact or as one's belief (something that may be called into question); assert
To contend is to believe something is a fact or to deal with a challenge.
To make clearly known; state or announce openly, formally, etc.
Maintain is defined as to keep in a current state in order to prevent from failing or breaking or to carry on or to support or provide.
To proclaim or assert; declare.
Proclaim is defined as to announce or declare.
To set forth in words, esp. in a specific, definite, or formal way
(Law) To administer a legal oath to:
Argue is defined as to verbally disagree with someone.
To declare openly or admit frankly
To state as a determination of fact:
Find another word for aver. In this page you can discover 25 synonyms, antonyms, idiomatic expressions, and related words for aver, like: affirm, assert, avouch, claim, contend, declare, emphasize, insist, justify, maintain and predicate.