Real Dictionary

hero
If you describe someone as your hero, you mean that you admire them a great deal, usually because of a particular quality or skill that they have.
countable noun: A hero is someone who has done something brave, new, or good, and who is therefore greatly admired by a lot of people.
countable noun: The hero of a book, play, film, or story is the main male character, who usually has good qualities.

hero in American English
a man of great strength and courage, favored by the gods and in part descended from them, often regarded as a half-god and worshiped after his death
noun: a man of distinguished courage or ability, admired for his brave deeds and noble qualities
noun: a priestess of Aphrodite who drowned herself after her lover Leander drowned while swimming the Hellespont to visit her

Hero in American English 1
a priestess of Aphrodite at Sestos: her lover, Leander, swims the Hellespont from Abydos every night to be with her; when he drowns in a storm, Hero throws herself into the sea

Hero in American English 2
Heron

hero in British English
noun: a person distinguished by exceptional courage, nobility, fortitude, etc

Hero in British English 1
noun: a priestess of Aphrodite, who killed herself when her lover Leander drowned while swimming the Hellespont to visit her

Hero in British English 2
noun: 1st century ad, Greek mathematician and inventor