noun
Refers to the branch of government that makes laws, such as a parliament or congress. Often used in political contexts.
立法部は新しい法律を審議する。
The legislature deliberates on new laws.
立法部と行政府の関係が重要だ。
The relationship between the legislature and the executive branch is important.
議会 can refer to any assembly or council, including local ones, whereas 立法部 emphasizes the law-making function.
Compound of 立法 (りっぽう, 'legislation') and 部 (ぶ, 'department' or 'branch'), literally 'legislation department'.