definition of
hero

[1] #1 hero n. a man distinguished by exceptional courage and nobility and strength; "RAF pilots were the heroes of the Battle of Britain". wn

[2] #2 hero n. the principal character in a play or movie or novel or poem. wn

[3] #3 hero n. [champion, fighter, paladin] someone who fights for a cause. wn

[4] #4 hero n. [Hero, Heron, Hero of Alexandria] Greek mathematician and inventor who devised a way to determine the area of a triangle and who described various mechanical devices (first century). wn

[5] #5 hero n. (classical mythology) a being of great strength and courage celebrated for bold exploits; often the offspring of a mortal and a god. wn