metadiegetic
Metadiegetic describes a narrative level nested within the diegesis, the fictional world of a story as experienced by its characters. In narratology and film theory, the diegetic level is the world where events unfold for the characters; a metadiegetic layer is a story or narration that exists inside that diegetic world—often produced by a character within the story or presented to other diegetic participants.
Etymology and usage: the term combines meta- with diegesis, signaling a level beyond or inside the main
Examples and implications: a character tells a story to other characters, and the events of that tale
See also: diegesis, extradiegetic, frame narrative, metalepsis.