"direct vote of the people," 1860 (originally in ref. to Italian unification), from Fr. plébiscite (1776 in modern sense), from L. plebiscitum "a decree or resolution of the people," from plebs (gen. plebis) "the common people" + scitum "decree," properly neuter pp. of sciscere "to assent, vote for, approve," inchoative of scire "to know" (see science). Used earlier (1533) in a purely Roman historical context.