By-Election
An election held to fill a single vacant seat between general elections, typically triggered by the death, resignation, or disqualification of a sitting legislator.
Explanation
A by-election (special election in American English) fills a vacancy in a legislature without requiring a full general election. Vacancies arise from death, resignation, appointment to another position, criminal conviction, or recall. By-elections are often treated as informal referendums on the sitting government's performance — a strong opposition result in a safe government seat signals political trouble ahead. In proportional representation systems using party lists, vacancies are usually filled automatically by the next candidate on the list, eliminating the need for by-elections. In the UK, by-elections have historically produced surprising results, including the Liberal Democrats' stunning Chesham and Amersham win in 2021 during the Boris Johnson government.
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