1) Affirmation 2) Assertion 3) Asseveration 4) Averment 5) Avowal 1) Affirmation 2) Avowal 3) Professing 4) Reaffirmation 5) Reassertion 
• (n.) The act of avouching; positive declaration.
A·vouch'ment noun The act of avouching; positive declaration. [ Obsolete] Milton. 
avouch, avouchment 1. To declare the provable truth or validity of; to affirm: 'The father avouched that his son could not have committed the crime.' 2. To corroborate or to confirm; to vouch for: 'Was the police officer able to avouch his accusations?' 3. To accept responsibility for (an action, for example); to acknowledge. 4. To avow; to conf...