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The Collaborative International Dictionary
Antemundane

Antemundane \An`te*mun"dane\, a. Being or occurring before the creation of the world.
--Young.

Douglas Harper's Etymology Dictionary
antemundane

"existing or happening before the creation of the world," 1731; see ante- + mundane.

Wiktionary
antemundane

a. Being or occurring prior to the creation of the world.