secessionist (n.)youdaoicibaDictYouDict[secessionist 词源字典]
1860, first recorded in U.S. context, from secession + -ist (colloquial short form secesh, noun and adjective, is attested from 1861); the earlier noun had been seceder, but this had religious overtones, especially in reference to Scottish Church history.[secessionist etymology, secessionist origin, 英语词源]