a character in US comics (=magazines with stories told in pictures), films, and television programmes. He came to Earth as a baby from an imaginary planet called Krypton, and he has great strength and special powers, including the ability to fly and to see through objects using X-ray vision. He uses his powers to save the world from being destroyed by evil characters. Most of the time he lives a normal life as Clark Kent, a reporter for the newspaper The Daily Planet, and no-one knows that he is Superman, not even his girlfriend, Lois Lane, who also works for the same newspaper. When his help is needed, he quickly changes from his ordinary clothes into a special uniform and becomes Superman.
Definition from the Longman Dictionary of Contemporary English Advanced Learner's Dictionary.