by-election

American  

[bahy-i-lek-shuhn] / ˈbaɪ ɪˌlɛk ʃən /

Or bye-election

noun

1. a special election, not held at the time of a general election, to fill a vacancy in Parliament.

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by-election British  

noun

1. (in the United Kingdom and other countries of the Commonwealth) an election held during the life of a parliament to fill a vacant seat in the lower chamber

2. (in the US) a special election to fill a vacant elective position with an unexpired term

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Etymology

Origin of by-election

First recorded in 1875–80; by- + election

Example Sentences

Plaid Cymru has launched its campaign for the Senedd election, comparing the battle for voters in May to its successful fight in 2025's Caerphilly by-election.

From BBC • Mar. 30, 2026

Last month she became the first Green Party candidate to win a parliamentary by-election.

From The Wall Street Journal • Mar. 16, 2026

Something similar happened in a parliamentary by-election in Britain in February, recently mentioned in this space in passing but now worth a closer look.

From The Wall Street Journal • Mar. 12, 2026

Llŷr Powell, who was the Reform UK candidate in the Caerphilly by-election, said his team had found AI-generated videos of him and his colleagues which put words in his mouth, lying about his policies.

From BBC • Mar. 9, 2026

Interest increased in the South Fox by-election as its first touchstone, and gathered almost romantically about Lorne Murchison as its spirited advocate.

From The Imperialist by Duncan, Sara Jeannette