noun
ward assembly election; local council election
Refers specifically to elections for the legislative body of a special ward (区) in Tokyo, or similar administrative wards in other cities. The term is formal and used in political and administrative contexts.
来月、区議会議員選挙が行われる予定です。
The ward assembly election is scheduled to be held next month.
区議会議員選挙の投票率は年々低下している。
Voter turnout in ward assembly elections has been declining year by year.
Compound of 区議会 (ward assembly) + 議員 (member) + 選挙 (election). The term is transparently derived from its components.