intellect
/ˈɪntəlɛkt/
The faculty of thinking, judging, abstract reasoning, and conceptual understanding; the cognitive faculty (uncountable)
Intellect is one of man's greatest powers.
The capacity of that faculty (in a particular person) (uncountable)
They were chosen because of their outstanding intellect.
A person who has that faculty to a great degree
Some of the world's leading intellects were meeting there.