Julia Kristeva in the context of "Abjection"

Intertextuality is the shaping of a text's meaning by another text, either through deliberate compositional strategies such as quotation, allusion, calque, plagiarism, translation, pastiche or parody, or by interconnections between similar or related works perceived by an audience or reader of the text. These references are sometimes made deliberately and depend on a reader's prior knowledge and understanding of the referent, but the effect of intertextuality is not always intentional and is sometimes inadvertent. Often associated with strategies employed by writers working in imaginative registers (fiction, poetry, and drama and even non-written texts like performance art and digital media), intertextuality may now be understood as intrinsic to any text.

Intertextuality has been differentiated into referential and typological categories. Referential intertextuality refers to the use of fragments in texts and the typological intertextuality refers to the use of pattern and structure in typical texts. A distinction can also be made between iterability and presupposition. Iterability makes reference to the "repeatability" of certain text that is composed of "traces", pieces of other texts that help constitute its meaning. Presupposition makes a reference to assumptions a text makes about its readers and its context. As philosopher William Irwin wrote, the term "has come to have almost as many meanings as users, from those faithful to Julia Kristeva's original vision to those who simply use it as a stylish way of talking about allusion and influence".

Lacanianism or Lacanian psychoanalysis is a theoretical system initiated by the work of Jacques Lacan from the 1950s to the 1980s. It is a theoretical approach that attempts to explain the mind, behaviour, and culture through a structuralist and post-structuralist extension of classical psychoanalysis. Lacanian perspectives contend that the human mind is structured by the world of language, known as the Symbolic. They stress the importance of desire, which is conceived of as perpetual and impossible to satisfy. Contemporary Lacanianism is characterised by a broad range of thought and extensive debate among Lacanians.

Lacanianism has been particularly influential in post-structuralism, literary theory, and feminist theory, as well as in various branches of critical theory, including queer theory. Equally, it has been criticised by the post-structuralists Deleuze and Guattari and by various feminist theorists. Outside France, it has had limited clinical influence on psychiatry. There is a Lacanian strand in left-wing politics, including Saul Newman's and Duane Rousselle's post-anarchism, Louis Althusser's structural Marxism, and the works of Slavoj Žižek and Alain Badiou. Influential figures in Lacanianism include Slavoj Žižek, Julia Kristeva and Serge Leclaire.