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Referendum from WikiPedia:

A referendum (plural referendums or referenda), ballot question, or plebiscite (from Latin plebiscita, originally a decree of the Concilium Plebis) is a direct vote in which an entire electorate is asked to either accept or reject a particular proposal. This may result in the adoption of a new constitution, a constitutional amendment, a law, the recall of an elected official or simply a specific government policy. The referendum or plebiscite is a form of direct democracy ideally favouring the majority. In the U.S. these are typically known as ballot or citizen initiatives when originated from the general population and referendums when legislative propositions are referred to the voting population.

Referendums and referenda are both commonly used as plurals of referendum. However, the use of referenda is deprecated by the Oxford English Dictionary which advises that:

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