mythopoeia

/ˌmɪθəˈpiːə/
noun
  1. The creation or making of myths, especially in literature or art.
    • The author's novel is a work of mythopoeia, inventing an entire pantheon of gods.
    • Students studied the mythopoeia of ancient cultures by analyzing their creation stories.
    • J.R.R. Tolkien's legendarium is a famous example of modern mythopoeia.
Synonyms
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