- One who withdraws or separates himself; especially, one
who withdraws from a church to which he has belonged; a seceder from an
established church; a dissenter; a nonconformist; a schismatic; a
sectary.
Meaning of 'separatist' (Princeton's WordNet)
1 . separatist
[ s]
Meaning (1): - having separated or advocating separation from another entity or policy or attitude