conviction (n.)youdaoicibaDictYouDict[conviction 词源字典]
mid-15c., "the proving of guilt," from Late Latin convictionem (nominative convictio) "proof, refutation," noun of action from past participle stem of convincere (see convince). Meaning "mental state of being convinced" is from 1690s; that of "firm belief, a belief held as proven" is from 1841.[conviction etymology, conviction origin, 英语词源]