Meaning

noun a vote by the electorate determining public opinion on a question of national importance

originSense 1 (“referendum”) is borrowed from French plébiscite, from Latin plēbiscītum, plēbis scītum, plēbī scītum (“law of the common people or plebs”), from plēbis (the genitive singular of plēbs (“common people, plebeians”)) + scītum (“decree, ordinance, statute”). Sense 3 (“law enacted by the common people”) is a learned borrowing from Latin plēbiscītum: see above. It is attested earlier than…

Etymology from Wiktionary, CC BY-SA 3.0