0 relating to or supporting secession (= the act of becoming independent and no longer part of a country, area, organization, etc.):
secessionist movements
1 someone who supports the idea of independence and no longer being part of a country, area, organization, etc.:
He was an ardent secessionist before the American Civil War.
the Yugoslav secessionist wars of the 1990s
It did not affect those crossing the border from the secessionist regions of Abkhazia and South Ossetia.
The letter sought to prohibit the secessionist parishes from using the church buildings.
Other countries face their own secessionist movements - Spain with the Basques, Romania with ethnic Hungarians, and Russia with Chechens.
For years, about a dozen Indian secessionist rebel groups have maintained bases in Burma's jungles.
The mayor believes the city should negotiate with secessionists so that a clear proposal is placed before voters.
Secessionists don't yet have anyone to head their campaign and fund-raising efforts.
An ardent secessionist, he resigned from the U. S. Navy even before his home state of Alabama seceded.