noun The control center of the central nervous system of an animal located in the skull, consisting of the cerebrum, cerebellum, and brainstem, which is responsible for perception, cognition, attention, memory, emotion, and action.
noun A part of the brain, especially associated with particular mental functions, abilities, etc.
noun skull; head
noun Mind.
I have too much on my brain today.
noun Intellect.
She has a lot of brains.
noun An intelligent person.
She was a total brain.
noun A person who provides the intelligence required for something.