epic

Concise Oxford English Dictionary © 2008 Oxford University Press:
epic/ˈepɪk/

▶noun

• 1 a long poem narrating the deeds of heroic or legendary figures or the past history of a nation.

  ■ a long film, book, or other work portraying heroic deeds or covering an extended period of time.

• 2 informal an extremely long and demanding task or activity.

▶adjective relating to or characteristic of an epic or epics.

– derivatives
epical adjective,
epically adverb.

– origin C16 (as adj.): via L. from Gk epikos, from epos ‘word, song’.