Definitions
1.NounA direct popular vote on an issue of public importance, such as an amendment to the constitution, a change in the sovereignty of the nation, or some government policy.
2.NounAn expression of the public's views on an issue, whether legally binding or not.
3.NounSynonym of plebiscitum (“a law enacted by the common people, under the superintendence of a tribune or some subordinate plebeian magistrate, without the intervention of the senate”).