noun
Refers to the quality of being based on logic, reason, or sound judgment. Often used in discussions of decision-making, systems, or arguments.
彼の提案には合理性が欠けている。
His proposal lacks rationality.
このシステムの合理性を説明してください。
Please explain the reasonableness of this system.
論理性 emphasizes logical consistency and coherence, while 合理性 is broader, encompassing practical reasonableness and efficiency.
Compound of 合理 (ごうり, 'rational') + 性 (せい, '-ity, -ness'), forming an abstract noun meaning 'rationality' or 'reasonableness'.