- (countable & uncountable) A reason to do something is why you do it, or the cause of something.
- The low price was the main reason for buying it.
- I asked them about the reason why we should go.
- The police are looking for the reason for the accident.
- (uncountable) Reason is the ability to think clearly.
- It's important to use reason to decide, not emotion.
- If you reason, you think carefully about something.
- (transitive) (uncommon) If you reason someone, you persuade using reasoning.
- I reasoned my friend into my religion.