someone who has exceptional intellectual ability and originality
"Mozart was a child genius"
"he's smart but he's no Einstein"
unusual mental ability
"The young student displayed an unusual mental ability when he solved the complex math problem in seconds without a calculator."
Someone possessing extraordinary intelligence or skill; especially somebody who has demonstrated this by a creative or original work in science, music, art etc.
"Einstein is widely regarded as a genius because his groundbreaking theories revolutionized our understanding of the universe."
In plain English: A genius is someone who has an amazing natural ability to learn and solve problems very quickly.
"The student showed genuine genius by solving the complex math problem in seconds."
Usage: Use the noun form to describe someone with exceptional intellectual ability or artistic talent rather than simply being smart. Reserve the adjective for describing ideas, solutions, or actions that are remarkably inventive and effective.
ingenious, brilliant, very clever, or original.
"Her genius design solved a problem that had baffled engineers for decades."
In plain English: Genius describes someone who is incredibly smart and has amazing natural talent for doing things very well.
"Her genius idea solved the problem in seconds."
The English word genius comes from the Latin term for an inborn nature or a protective deity associated with a person or place. It ultimately traces back to the idea of being born, derived from the Proto-Indo-European root meaning "to beget."