Русско-англо-русский юридический словарь

A referendum (plural: referendums or less commonly referenda) is a direct and universal vote in which an entire electorate is invited to vote on a particular proposal and can have nationwide or local forms. This may result in the adoption of a new policy or specific law. In some countries, it is synonymous with a plebiscite or a vote on a ballot question. (Wikipedia)

About a million people took part in Saturday's protest in London demanding a referendum on the UK's Brexit deal. (BBC News)