| verb | establish or strengthen as with new evidence or facts “his story confirmed my doubts” |
| verb | to declare or affirm solemnly and formally as true “Before God I swear I am innocent” |
| verb | say yes to |
| confirmative | adjective | serving to support or corroborate |
| confirmatory | adjective | serving to support or corroborate |
| confirmation | noun | information that confirms or verifies |
| corroborative | adjective | serving to support or corroborate |
| corroboratory | adjective | serving to support or corroborate |
| corroboration | noun | confirmation that some fact or statement is true through the use of documentary evidence |
| sustainable | adjective | capable of being sustained |
| substantiative | adjective | serving to support or corroborate |
| substantiation | noun | additional proof that something that was believed (some fact or hypothesis or theory) is correct |
| support | noun | documentary validation |
| affirmable | adjective | capable of being affirmed or asserted |
| affirmation | noun | a judgment by a higher court that the judgment of a lower court was correct and should stand |
| affirmer | noun | someone who claims to speak the truth |
| assertable | adjective | capable of being affirmed or asserted |
| assertion | noun | the act of affirming or asserting or stating something |
| asserter | noun | someone who claims to speak the truth |
| avower | noun | someone who claims to speak the truth |
| avowal | noun | a statement asserting the existence or the truth of something |
| averment | noun | a declaration that is made emphatically (as if no supporting evidence were necessary) |
| swearer | noun | someone who takes a solemn oath |
| swearing | noun | a commitment to tell the truth (especially in a court of law); to lie under oath is to become subject to prosecution for perjury |
| affirmative | adjective | affirming or giving assent |
| affirmatory | adjective | affirming or giving assent |