unicameral system; unicameralism
Political term referring to a legislature with a single chamber, as opposed to a bicameral system (二院制).
その国は一院制を採用している。
That country has adopted a unicameral system.
Bicameral system (two chambers), the opposite of 一院制.
一院制 describes a unicameral system with a single legislative chamber, whereas 両院 refers to the two chambers of a bicameral legislature.
二院 refers to the two houses of a bicameral system, while 一院制 describes a unicameral system with only a single legislative chamber.
Compound of 一 (one), 院 (chamber, house), and 制 (system).