1. causes, explanations, or justifications for an action or event
Usage: plural of reason
2. the power of the mind to think, understand, and form judgments logically
Usage: uncountable when referring to mental faculty

1. thinks, understands, and forms judgments by a process of logic
Usage: third person singular present of reason

Examples

• She gave several reasons for her decision to quit.
• There are many reasons why people choose to exercise regularly.
• He reasons through problems step by step.
• The detective reasons that the suspect must have had a key.
• What are your reasons for believing that theory?
• She reasons carefully before making important decisions.
• The reasons behind the policy change were not explained clearly.