superhero (n.)

late 14c., "man of superhuman strength or physical courage," from Old French heroe (14c., Modern French héros), from Latin heros (plural heroes) "hero, demi-god, illustrious man," from Greek hērōs (plural hērōes) "demi-god." This is of uncertain origin; according to an old theory perhaps originally "defender, protector" and (Pokorny, Watkins) from PIE root *ser- (1) "to protect," but Beekes writes that it is "Probably a Pre-Greek word."

In Homer, of the Greeks before Troy, then a comprehensive term used of warriors generally, also of all free men in the Heroic Age. In classical mythology from at least the time of Hesiod (8c. B.C.E.) "man born from a god and a mortal," especially one who had done service to mankind; with the exception of Heracles limited to local deities and patrons of cities.

In English the meaning "man who exhibits great bravery" in any course of action is from 1660s. The sense of "chief male character in a play, story, etc." is recorded by 1690s. Hero-worship is from 1713 in reference to ancient cults and mysteries; of living men by 1830s.

also super-heroine, fem. of superhero; see heroine. Attested by 1931 in reference to a novel plot's heroine; by 1939 of Mrs. Edna Watson, credited with saving lives in an airline crash at sea; by 1940 in newspaper advertisements for a comic strip, "Invisible Scarlet O'Neil."

word-forming element of Latin origin meaning "above, over" in place or position; also in manner, degree, or measure, "over, beyond;" from Latin super (adverb and preposition) "above, over, on the top (of), beyond, besides, in addition to." This is from *(s)uper-, variant form of PIE root *uper "over."

In English words from Old French, it appears as sur-. Most of the Latin compounds in it are post-classical; it has been a living element in English since 15c. In Medieval Latin and Romanic languages it can be confused with related supra-, and some English words exist in both forms.

In 17c., when many English compounds in super- were coined in religious and spiritual writing, the notion in it was "beyond; not partaking of." Hence superordinary "excellent, better than what is common or usual" (1620s); supersensual "above or beyond the senses, imperceptible to human sense" (1680s); super-rational "that is above or beyond the scope of reason" (1680s).

But it also was used in the sciences in the sense of "in or to the highest or a very high degree," and has come to be felt popularly as "in an exaggerated degree, very much," as in supersensitive "extremely sensitive" (1839); supercool "very fashionable" (1970), which runs contrary to the old sense. Hence supersexual, attested by 1895 as "transcending sexuality; 'platonic' " and by 1968 as "sexual in an extreme degree." Also compare superhuman, which in the 1630s meant "divine, above or beyond what is human," but, by c. 1800, also, and typically since, meant "above the powers or nature of man."