Brexit (a portmanteau of "British" and "exit") is the withdrawal of the United Kingdom from the European Union. Following a referendum held on 23 June 2016 in which 51.9 percent of those voting supported leaving the EU, the Government invoked Article 50 of the Treaty of the European Union which started a two-year leaving process which was due to conclude with the UK's exit on the 29 March 2019 and then, after an extension, on 31 October 2019. The UK left the EU on 31 January 2020.