To make firm, or more firm; add strength to; strengthen: as, one's resolution is confirmed by the approval of another.To settle or establish; render fixed or secure.To make certain or sure; give new assurance of truth or certainty to; put past doubt; verify.To certify or give assurance to; inform positively.To sanction; ratify; consummate; make valid or binding by some formal or legal act: as, to confirm an agreement, promise, covenant, or title.To strengthen in resolution, purpose, or opinion; fortify.Eccles., to admit to the full privileges of church-membership by the imposition of hands; administer the rite of confirmation to. See confirmation, 1 .Synonyms Corroborate, substantiate.