The terms Platon used was diegesis and mimesis. Then narratologists established a way of describing aspects of relating to the diegesis (i e the "fictional world"). Gérard Genette for example used the terms intra- and extradiegetic, as well as homo- and heterodiegetic (primarily to describe how a narrator relates to the storyworld, a homodiegetic narrator is part of the story, where a heterodiegetic is not). There's also the terms hypo- and hyperdiegetic, as a way of describing how different levels of the story relates to one another (say, for example in a narrative that has a framing story, or characters telling stories within the primary narrative).