IPA: /ˌɛpəˈpeɪə/
KK: /ɛpəˈpeɪə/
A long narrative poem that tells the story of heroic deeds and events significant to a culture or nation.
The ancient Greeks often recited epopoeias that celebrated their heroes and gods.
Epopoeia is derived from the Greek "epopoiia" (meaning a narrative or epic poem) which combines "epo-" (meaning to speak) and "poiein" (meaning to make or create). The term refers to the act of creating a narrative or epic tale, often in a poetic form.
Think of 'speaking' ('epo-') to 'create' ('poiein') a grand story — that's why epopoeia refers to the creation of an epic narrative.