Definition of subcreation in US English:

subcreation

noun

  • 1A secondary or subsidiary creation.

  • 2Specifically J. R. R. Tolkien's word for: the action or process of creating a fully realized and internally consistent imaginary (or ‘secondary’) world.

Origin

Mid 19th century; earliest use found in Literary Gazette. From sub- + creation.

Pronunciation

subcreation

/ˌsʌbkrɪˈeɪʃn/