[f. prec. + -IST.] A supporter of a congress; a member of a congressional party.
1891. Pall Mall G., 4 March, 2/2 (Chili). The Congressionalists are represented as having no troops.
1891. Times, 26 Feb., 5/3. President Balmaceda has initiated a guerre à mort against the Congressionalists [in Chili].