D defs.my
Entry 2 senses Webster, 1913

Secessionist

· Se·ces·sion·ist · IPA /sɪsˈɛʃənɪst/
01 n. One who upholds secession.
  1. 1.
    One who upholds secession.
  2. 2.
    One who holds to the belief that a State has the right to separate from the Union at its will.(U.S. Hist.)