REFERENDUM
referendum
(noun) a legislative act is referred for final approval to a popular vote by the electorate
Source: WordNet® 3.1
Etymology
Noun
referendum (plural referenda or referendums)
(politics) A direct popular vote on a proposed law or constitutional amendment. The adposition on is usually used before the related subject of the vote.
An action, choice, etc, which is perceived as passing judgment on another matter.
Source: Wiktionary
Ref`er*en"dum (rf`r*n"dm), n. Etym: [Gerundive fr. L. referre. See
Refer.]
1. A diplomatic agent's note asking for instructions from his
government concerning a particular matter or point.
2. The right to approve or reject by popular vote a meassure passed
upon by a legislature.
Source: Webster’s Unabridged Dictionary 1913 Edition