(countable) Someone possessing extraordinary intelligence or skill; especially somebody who has demonstrated this by a creative or original work in science, music, art etc.

(uncountable) Extraordinary mental capacity.

(uncountable) Inspiration, a mental leap, an extraordinary creative process.

(countable, Roman mythology, also figurative) The tutelary deity or spirit of a place or person.

(informal) Ingenious, brilliant, very clever, or original.