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Definition of intellectual : 1. Belonging to, or performed by, the intellect; mental; as, intellectual powers, activities, etc.
2. 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.
3. Relating to the understanding; treating of the mind; as, intellectual philosophy, sometimes called mental philosophy.
4. Suitable for exercising the intellect; formed by, and existing for, the intellect alone; perceived by the intellect; as, intellectual employments.
5. The intellect or understanding; mental powers or faculties.

Synonyms:

reason, apt, dexterous, able, happy, highbrow, quick, bookish, mind, quick-witted, serious, talented, noetic, highbrowed, studious, ingenious, ability, reflective, thoughtful, study at intelligent, good, psychical, intellect, psychic, keen, mental, skilful, adroit, brain, intellective

cogent, gifted, brainy, profound, sharp, knowing, clever, erudite, sophisticated, bright, comprehending, knowledgeable, smart, capable, perspicacious, worldly, canny, astute, encyclopedic

encylopedic, competent, streetwise, informed, shrewd, learned, educated, omniscient, experienced, cognizant, versed

psychological, rational, egghead, cerebral, reasoning, understanding, thinking

sagacious, intelligent, scholarly, wise, brilliant, philosophic, authoritative, adept

genius, academic, professor, master, philosopher, scholar, doctor, expert, student

savant, mandarin, thinker, wise person, guru, sage, consultant, authority

Usage examples:

• Intellectual sympathy will do it, too. - "Pebbles on the Shore", Alpha of the Plough (Alfred George Gardiner).
• But that was a moral and intellectual fear. - "Dr. Johnson and His Circle", John Bailey.
• His youth should be in mind, but it should also be remembered that he is a lad of high intellectual power, older than most men of his age. - "The Eagle's Heart", Hamlin Garland.