Hypothetical

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Hypothetical : involving or being based on a suggested idea or theory : being or involving a hypothesis : conjectural — Webster See also OneLook

Realm : kingdom, sphere, domain — Webster See also OneLook

Hypothetical Realm : conjectural kingdom, sphere, or domain involving or based on a suggested idea or theory — M.E.Hopper

Thesaurus

Roget’s II (Thesaurus.com), Merriam-Webster Thesaurus, Visuwords

Encyclopedia

Hypotheticals are possibly situations, statements or questions about something imaginary rather than something real. Hypotheticals could deal with the concept of “what if?”‘. — Wikipedia

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Innovation

Science

Hypothetical Species (Wikipedia)

List of Hypothetical Solar System Objects (Wikipedia)

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Preservation

History

Counterfactual history, also sometimes referred to as virtual history, is a form of historiography that attempts to answer “what if” questions known as counterfactuals. The method seeks to explore history and historical incidents by means of extrapolating a timeline in which certain key historical events did not happen or had an outcome which was different from that which did in fact occur. It has produced a book genre which is variously called alternative history, speculative history, or hypothetical history. — Wikipedia

Counterfactual History and the History of Technology (Eric Schatzberg, Technology’s Stories)