The Oxford Thesaurus An A-Z Dictionary of Synonyms - convictionn.

1) proof of guilt: After his conviction, he was sentenced to life imprisonment. 2) belief, opinion, view, persuasion, position: It is her conviction that the painting is by Titian. 3 certainty, sureness, positiveness, confidence, assurance, certitude: He doesn't have the courage to back up his convictions.