1. adjective /ˌɪntəˈlɛktʃuəl/
b) Endowed with intellect; having the power of understanding; having capacity for the higher forms of knowledge or thought; characterized by intelligence or mental capacity; as, an intellectual person.
Ant: non-intellectual
2. noun /ˌɪntəˈlɛktʃuəl/
a) An intelligent person, someone interested in intellectual matters.
Wikipedia foundation.