- A basis, justification, or motivator for an action or decision
- The mental ability to comprehend, infer, or make discernments in an orderly manner
- The deployment of mental faculties in a sensible and correct manner
- The prosecutor questioned the defendant's reason for being at the scene of the crime.
- The judge asked the jury to use their ability to reason when assessing the evidence.
- Doctors examined whether the suspect was competent and capable of reason at the time of the incident.