reason >> /ˈrizən/
Definition: [noun] A cause, explanation, or justification for an action or event.
Example: the minister resigned for personal reasons
Definition: [noun] The power of the mind to think, understand, and form judgments by a process of logic.
Example: there is a close connection between reason and emotion
Definition: [intransitive verb] Think, understand, and form judgments by a process of logic.
Example: humans do not reason entirely from facts