affirm
1. [ verb ] establish or strengthen as with new evidence or facts
Synonyms: confirm support corroborate substantiate sustain
Examples:

"his story confirmed my doubts" "The evidence supports the defendant"

Related terms: negate prove demonstrate verify validate substantiate document vouch validation documentation confirmation affirmation
2. [ verb ] to declare or affirm solemnly and formally as true
Synonyms: swear assert swan aver verify avow
Examples:

"Before God I swear I am innocent"

Related terms: declare declare hold declare assure claim attest protest avowal affirmation swearer affirmer
3. [ verb ] say yes to
Related terms: claim accept reaffirm confirm maintain affirmation
Similar spelling:   affirmer
  affirmed