Formal term for a formal proposal or motion, often used in legislative, organizational, or committee contexts.
委員会は新しい規則の建議案を審議した。
The committee deliberated on the proposal for new regulations.
Compound of 建議 (けんぎ, 'proposal, recommendation') and 案 (あん, 'plan, draft'). The exact historical derivation is uncertain, but the combination yields the meaning 'formal proposition'.