Definition of "intertextuality"

intertextuality

noun
countable and uncountable, plural intertextualities
1. The idea that a given text is a response to what has already been written, be it explicit or implicit.
  Quotations
  All of these issues—subjectivity, intertextuality, reference, ideology—underlie the problematized relations between history and fiction in postmodernism.
  1988, Linda Hutcheon, A Poetics of Postmodernism: History, Theory, Fiction, Routledge
  From the translator's point of view, therefore, both types of intertextuality—or simply all kinds of intertextuality—are important, since the translator, ideally, ought not to deprive the reader of even a smallest chunk of the intertextual load of the original.
  2017, Aleksander Rzyman, The Intertextuality of Terry Pratchett's Discworld as a Major Challenge for the Translator, Cambridge Scholars Publishing, page 11
2. The reference to another separate and distinct text within a text.