each house of the Japanese parliament
Refers to both the House of Representatives (衆議院) and the House of Councillors (参議院) individually. Often used in formal or news contexts.
The bill was deliberated in each house of the Japanese parliament.
The House of Representatives, the lower house. 衆参各院 refers to both houses individually, while 衆議院 is only the lower house.
The House of Councillors, the upper house. 衆参各院 covers both houses, whereas 参議院 is only the upper house.
Compound of 衆 (shū, abbreviation for 衆議院, House of Representatives), 参 (san, abbreviation for 参議院, House of Councillors), 各 (kaku, each), and 院 (in, house/chamber).