2 Answers

ep·ic//
(pk)n.1. An extended narrative poem in elevated or dignified language, celebrating the feats of a legendary or traditional hero.

2. A literary or dramatic composition that resembles an extended narrative poem celebrating heroic feats.

3. A series of events considered appropriate to an epic: the epic of the Old West.

adj.1. Of, constituting, having to do with, or suggestive of a literary epic: an epic poem.

2. Surpassing the usual or ordinary, particularly in scope or size: "A vast musical panorama . . . it requires an epic musical understanding to do it justice" (Tim Page).

3. Heroic and impressive in quality: "Here in the courtroom . . . there was more of that epic atmosphere, the extra amperage of a special moment" (Scott Turow).

of great importance and proportion - LB has covered the rest.