A branch of metaphysics and/or philosophy that deals with the nature of being. Think things like existence and reality.
In thinking about fantasy as a literature of the impossible, we are thinking about its worlds (about what is called its “ontology,” the science of the kind of beings that can exist in such a world, also known as world building) as if they were “real” (by which I mean: as if they were complete and consistent ideal objects[…]).
Professor Geoff Boucher
I'm a cloud student. 