reason

US /ˈriː.zən/
UK /ˈriː.zən/
"reason" picture
1.

a cause, explanation, or justification for an action or event

:
The reason for his absence was illness.
What's your reason for doing that?
2.

the power of the mind to think, understand, and form judgments logically

:
Humans are capable of complex reason.
He lost his reason and started shouting.
1.

think, understand, and form judgments logically

:
He tried to reason with her, but she wouldn't listen.
We need to reason through this problem carefully.