1) Affirmation 2) Assertion 3) Asseveration 4) Avouchment 5) Avowal 6) Claim 7) Contention 8) Ipsedixitism 1) Affirmation 2) Assertion 3) Asseveration 4) Declaration 5) French word used in English 6) The act of averring 
• (v. t.) The act of averring, or that which is averred; affirmation; positive assertion. • (v. t.) Verification; establishment by evidence. • (v. t.) A positive statement of facts; an allegation; an offer to justify or prove what is alleged.
A·ver'ment noun [ Confer Old French averement , Late Latin averamentum . See Aver , transitive verb ] 1. The act of averring, or that which is averred; affirmation; positive assertion. « Signally has this averment received illustrati...
From the Latin verificare, or the French averrer, and signifies a positive statement of facts in opposition to argument or inference.
the act of averring. · a positive statement.