(n): a person who rules or guides or inspires others
(n): the principal character in a play or movie or novel or poem
(n): an actor's portrayal of someone in a play
(n): someone who fights for a cause
(n): a person who cares for persons or property
(n): Greek mathematician and inventor who devised a way to determine the area of a triangle and who described various mechanical devices (first century)
(n): a person skilled in mathematics
(n): someone who is the first to think of or make something
(n): (classical mythology) a being of great strength and courage celebrated for bold exploits; often the offspring of a mortal and a god
(n): an imaginary being of myth or fable
(n): (Greek mythology) priestess of Aphrodite who killed herself when her lover Leander drowned while trying to swim the Hellespont to see her
(n): an imaginary being of myth or fable
(n): a large sandwich made of a long crusty roll split lengthwise and filled with meats and cheese (and tomato and onion and lettuce and condiments); different names are used in different sections of the United States
(n): two (or more) slices of bread with a filling between them
See beauty.
I like this definition by Poets of the Fall (worth it for the weird video):
'Is there a hero somewhere, someone who appears and saves the day:
Someone who holds out a hand and turns back time?
Is there a hero somewhere, someone who will never walk away,
Who doesn't turn a blind eye to a crime?'
"Do you know what the definition of a hero is? Someone who gets other people killed." - Zoe, "Serenity"