Reason
n.
The faculty or capacity of the human mind by which it is
distinguished from the intelligence of the inferior animals; the higher
as distinguished from the lower cognitive faculties, sense,
imagination, and memory, and in contrast to the feelings and desires.
Reason comprises conception, judgment, reasoning, and the intuitional
faculty. Specifically, it is the intuitional faculty, or the faculty of
first truths, as distinguished from the understanding, which is called
the discursive or ratiocinative faculty.