1. a cause, explanation, or justification for an action or event
2. the power of the mind to think, understand, and form judgments logically
3. good judgment; what is right or practical

1. to think, understand, and form judgments by a process of logic
2. to persuade someone with logical arguments

Examples

• The reason for the delay was heavy traffic.
• She couldn’t understand the reason behind his decision.
• Use reason, not emotion, to solve this problem.
• There’s no reason to be upset about this.
• Scientists reason from evidence to reach conclusions.
• I tried to reason with him, but he wouldn’t listen.
• The detective reasoned that the suspect must have had a key.
• Let’s try to reason through this problem step by step.