What is the meaning of epic?

noun

• A long narrative poem telling of a hero's deeds.
  • synonyms: epic poem, heroic poem, epos

adjective

• Very imposing or impressive; surpassing the ordinary (especially in size or scale. )
  • usage: "an epic voyage"; "of heroic proportions"; "heroic sculpture"
  • synonyms: heroic, larger-than-life
• Constituting or having to do with or suggestive of a literary epic.
  • usage: "epic tradition"
  • synonyms: epical