Definition of heroic fantasy in US English:

heroic fantasy

noun

  • 1A daydream or fantasy centring on imagined heroic acts or accomplishments; compare "hero fantasy".

  • 2A work of fiction which deals with the adventures of a heroic figure; (now) specifically a subgenre of science fiction and fantasy literature featuring the adventures of a hero in a (more or less) imaginary world.

Origin

Late 18th century; earliest use found in William Combe (1742–1823), writer and literary imitator.