noun
- a person who secedes, advocates secession, or claims secession as a constitutional right.
adjective
- of or relating to secession or secessionists.
n.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.