conclusive (adj.)youdaoicibaDictYouDict[conclusive 词源字典]
1610s, "occurring at the end," from French conclusif, from Late Latin conclusivus, from conclus-, past participle stem of concludere (see conclude). Meaning "definitive, decisive, convincing" (putting an end to debate) is from 1640s. Related: Conclusiveness.[conclusive etymology, conclusive origin, 英语词源]