1.NounSomeone possessing extraordinary intelligence or skill; especially somebody who has demonstrated this by a creative or original work in science, music, art, etc.
"She's a genius; she won a Nobel Prize at fifteen!"
2.NounExtraordinary mental capacity.
3.NounInspiration, a mental leap, an extraordinary creative process.
"a work of genius; to add a dash of cinnamon amid such umami was pure genius"
4.NounThe tutelary deity or spirit of a place or person.
"and the genius of the place: the growing enthusiasm for codified standards in the Army and Navy"
5.AdjectiveIngenious, brilliant, very clever, or original.