an·​ti·​world | \ˈanˌtī, ˈantē, ˈantə̇ + ˌ\

Definition of antiworld 

: the hypothetical antimatter counterpart of a world

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First Known Use of antiworld

circa 1958, in the meaning defined above

History and Etymology for antiworld

anti- entry 1 + world entry 1

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The first known use of antiworld was circa 1958

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