I think the defintion of a hero who acts using selflessness. To do a good deed without caring

about self preservation .No, I don't think the definition of hero changes over time because

heroes don't change so why should the definition also heroes are no t just superman and batman they can be regular eople like you and me . Your nextdoor neighbor can a hero but he can't fly or fight . Also to be a hero doesn't have to save anyone to be a hero , A hero can be a person making a good life their self and/or family