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"direct vote of the people," 1860 (originally in reference to Italian unification), from French plébiscite (1776 in modern sense, originally with reference to Switzerland), from Latin plebiscitum "a decree or resolution of the people," from plebs (genitive plebis) "the common people" (see plebeian (adj.)) + scitum "decree," noun use of neuter past participle of sciscere "to assent, vote for, approve," inchoative of scire "to know" (see science). Used earlier (1530s) in a purely Roman historical context. Related: Plebiscitary.
A vote of an entire nation or other large political unit on an issue of great importance. A plebiscite is not an election, for there are no candidates. Rather, people vote yes or no on a proposition.