noun

1. The faculty of thinking, judging, abstract reasoning, and conceptual understanding; the cognitive faculty (uncountable)

   “Intellect is one of man's greatest powers.”

2. The capacity of that faculty (in a particular person) (uncountable)

   “They were chosen because of their outstanding intellect.”

3. A person who has that faculty to a great degree

   “Some of the world's leading intellects were meeting there.”