1. the quality of being based on or in accordance with reason or logic
2. the ability to think clearly and make decisions based on reason rather than emotion

Examples

• The committee's decision was based on rationality rather than personal feelings.
• She questioned the rationality of spending so much money on the project.
• His rationality helped him solve the complex problem step by step.
• The debate required rationality and careful consideration of all facts.
• Scientists value rationality in their approach to research.
• The policy lacked rationality and seemed to ignore basic economic principles.