A special election between regular elections(noun)
WordNet. Princeton University. 2010.
Use "bye-election" in a sentence
"This bye-election will be a pointer to a deep hole they've dug themselves into."
"It was hard to hear the bye-election results as the National Front kept shouting."
"The political elite, which loathes the electorate it claims to represent, has done its best to laugh off David Davis 'decision to resign and fight a bye-election on the issue of our essential freedoms and to present him as, well, not to put too fine a point on it, barking mad."