noun
the two houses of legislature; bicameral legislature
Refers to a legislative body with two chambers, such as the House of Representatives and the House of Councillors in Japan.
日本の国会は二院制をとっている。
Japan's National Diet has a bicameral system.
二院の役割について議論が行われた。
There was a discussion about the roles of the two houses.
参議院 is the House of Councillors, the other house; 二院 encompasses both this and 衆議院.
Compound of 二 (two) and 院 (institution, house), referring to the two chambers of a legislature.