Synonyms of 'referendum'
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A ballot is a secret vote in which people select a candidate in an election, or express their opinion about something.
The result of the ballot will not be known for two weeks.
A plebiscite is a direct vote by the people of a country or region in which they say whether they agree or disagree with a particular policy, for example whether a region should become an independent state.
The future of the country should be decided by plebiscite.
Thesaurus for referendum from the Collins English Thesaurus
If a country holds a referendum on a particular policy , they ask the people to vote on the policy and show whether or not they agree with it.