What term describes a two-house legislature?

A two-house legislature is referred to as bicameral. This term is derived from the Latin word "bi," meaning two, which indicates that the legislative body is divided into two distinct chambers, typically known as the House of Representatives and the Senate in the context of the United States Congress. Bicameral legislatures are designed to provide a system of checks and balances and often ensure more deliberate and thorough law-making processes, as legislation typically must be approved by both chambers before becoming law.

In contrast, other terms such as unicameral refer to a single-chamber legislature, multicameral means a legislature with more than two chambers, and tricameral indicates a three-chamber legislature. These alternatives do not apply to the definition of a two-house system and illustrate the diversity in legislative structures.