epic (adj.)

1580s, "pertaining to or constituting a lengthy heroic poem," via French épique or directly from Latin epicus, from Greek epikos, from epos "a word; a tale, story; promise, prophecy, proverb; poetry in heroic verse" (from PIE root *wekw- "to speak").

Extended sense of "grand, heroic" first recorded in English 1731. From 1706 as a noun in reference to an epic poem, "A long narrative told on a grand scale of time and place, featuring a larger-than-life protagonist and heroic actions" [Miller Williams, "Patterns of Poetry"]. Earlier as "an epic poet" (1630s).

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Definitions of epic from WordNet
epic (adj.)
very imposing or impressive; surpassing the ordinary (especially in size or scale);
an epic voyage
Synonyms: heroic / larger-than-life
epic (adj.)
constituting or having to do with or suggestive of a literary epic;
epic tradition
Synonyms: epical
epic (n.)
a long narrative poem telling of a hero's deeds;
Synonyms: epic poem / heroic poem / epos