柯林斯詞典by-election (by-elections) 1. N-COUNT A by-election is an election that is held to choose a new member of parliament or another legislature when a member has resigned or died. 補(bǔ)缺選舉[英國英語] 返回 by-election劍橋詞典in the UK, an election that happens at a different time from a main election , to choose a Member of Parliament to replace one who has died or left his or her job （英國議員的）補(bǔ)缺選舉，補(bǔ)選 返回 by-election