In critical theory, abjection is the state of being cast off and separated from norms and rules, especially on the scale of society and morality. The term has been explored in post-structuralism as that which inherently disturbs conventional identity and cultural concepts. Julia Kristeva explored an influential and formative overview of the concept in her 1980 work Powers of Horror: An Essay on Abjection, where she describes subjective horror (abjection) as the feeling when an individual experiences or is confronted by the sheer experience of what Kristeva calls one's typically repressed "corporeal reality", or an intrusion of the Real in the Symbolic Order.

Kristeva's concept of abjection is used most commonly to analyze popular cultural narratives of horror, and discriminatory behavior manifesting in misogyny, misandry, homophobia and genocide. The concept of abjection builds on the traditional psychoanalytic theories of Sigmund Freud and Jacques Lacan, whose studies often narrowed in on the experience of the disintegration of personal distinctions, through neurosis in Freud and psychosis in Lacan.

In literary critical theory Drawing on the French tradition of interest in the monstrous (e.g., novelist Louis-Ferdinand Céline),Geoffrey Brereton, A Short History of French Literature (1954), p. 246. and of the subject as grounded in "filth" (e.g., psychoanalyst Jacques Lacan),Jacques Lacan, The Four Fundamental Concepts of Psycho-Analysis (1994), p. 258. Julia Kristeva developed the idea of the abject as that which is rejected by or disturbs social reasonthe communal consensus that underpins a social order.Julia Kristeva, Powers of Horror: An Essay on Abjection (1982)m p. 65. The "abject" exists accordingly somewhere between the concept of an object and the concept of the subject, representing taboo elements of the self barely separated off in a liminal space.Childers/Hentzi, p. 308. Kristeva claims that within the boundaries of what one defines as subjecta part of oneselfand objectsomething that exists independently of oneselfthere reside pieces that were once categorized as a part of oneself or one's identity that has since been rejectedthe abject.

However, Kristeva created a distinction in the true meaning of abjection: "It is thus not the lack of cleanliness or health that causes abjection but what disturbs identity, system, and order. What does not respect borders, positions, rules. The in-between, the ambiguous, the composite."Kristeva, "Powers of Horror", p. 4; Guberman, "Julia Kristeva Interviews", (1996). Since the abject is situated outside the symbolic order, being forced to face it is an inherently traumatic experience, as with the repulsion presented by confrontation with filth, waste, or a corpsean object which is violently cast out of the cultural world, having once been a subject. Thus the sense of the abject complements the existence of the superegothe representative of culture, of the symbolic order:Kristeva, p. 15. in Kristeva's aphorism, "To each ego its object, to each superego its abject."Kristeva, p. 2.

From Kristeva's psychoanalytic perspective, abjection is done to the part of ourselves that we exclude: the mother. We must abject the maternal, the object which has created us, in order to construct an identity. Abjection occurs on the micro level of the speaking being, through their subjective dynamics, as well as on the macro level of society, through "language as a common and universal law". We use rituals, specifically those of defilement, to attempt to maintain clear boundaries between nature and society, the semiotic and the symbolic, paradoxically both excluding and renewing contact with the abject in the ritual act.Barbara Creed, in Ken Gelder, The Horror Reader (2000), p. 64.

The concept of abjection is often coupled (and sometimes confused) with the idea of the uncanny, the concept of something being "un-home-like", or foreign, yet familiar.Childers/Hentzi, p. 1 The abject can be uncanny in the sense that we can recognize aspects in it, despite its being "foreign": a corpse, having fallen out of the symbolic order, creates abjection through its uncanninessWinifred Menninghaus, Disgust (2003), p. 374.creates a cognitive dissonance.

Cases Abjection is a major theme of the 1949 work The Thief's Journal (Journal du Voleur) by French author Jean Genet, a fictionalised account of his wanderings through Europe in the 1930s, wherein he claims as a criminal outcast to actively seek abjections as an existentialist form of "sainthood"Gene A. Plunka, The Rites of Passage of Jean Genet (1992), p. 49. The film Alien (1979) has been analysed as an example of how in horror and science fiction monstrous representations of the female resonate with the abject archaic figure of the mother.Barbara Creed, The Monstrous Feminine (1993), p. 16. Bodily dismemberment, forcible impregnation, and the chameleon nature of the alien itself may all be seen as explorations of phantasies of the primal scene, and of the encounter with the boundaryless nature of the original abject mother.Creed, p. 17 and p. 26–9. The 1990s-era Australian literary genre grunge lit often focuses on young adult characters with "abject" bodies Gelder K. and Salzman P. After the celebration: Australian fiction 1989–2007. Melbourne: Melbourne University Press, 2009. that are deteriorating and characters facing health problems. For example, the male and female lead characters in Andrew McGahan's book Praise, Gordon Buchanan and Cynthia Lamonde, both have diseased bodies, with Cynthia facing skin that breaks out in rashes. Karen Brooks states that Clare Mendes' Drift Street, Edward Berridge's The Lives of the Saints, and Praise "...explor[e] the psychosocial and psychosexual limitations of young sub/urban characters in relation to the imaginary and socially constructed boundaries defining...self and other" and "opening up" new "limnal [boundary] spaces" where the concept of an abject human body can be explored. Brooks states that the marginalized characters (in The Lives of the Saints, Drift Street and Praise) are able to stay in "shit creek" (an undesirable setting or situation) and "diver[t]... flows" of these "creeks", thus claiming their rough settings' "limnality" (being in a border situation or transitional setting) and their own "abjection" (having "abject bodies" with health problems, disease, etc.) as "sites of symbolic empowerment and agency".

In social critical theory "Abjection" is often used to describe the state of often-marginalized groups, such as women, unwed mothers, people of minority religious faiths, sex workers, convicts, and poor and disabled people. From a deconstruction of sexual discourses and gender history Ian McCormick has outlined the recurring links between pleasurable transgressive desire, deviant categories of behaviour and responses to body fluids in 18th and 19th-century discussions of prostitution, sodomy, and masturbation (self-pollution, impurity, uncleanness).Sexual Outcasts. 4 vols., edited with introductions by Ian McCormick (London and New York: Routledge, 2000). The term space of abjection is also used, referring to a space that abjected things or beings inhabit.

In organizational studies Organizational theory literature on abjection has attempted to illuminate various ways in which institutions come to silence, exclude or disavow feelings, practices, groups or discourses within the workplace. Studies have examined and demonstrated the manner in which people adopt roles, identities and discourses to avoid the consequences of social and organizational abjection.Kenny (2010); Bulter (2004); cited in Risque, "States of Abjection" (2013), p. 1279–80. In such studies the focus is often placed upon a group of people within an organization or institution that fall outside of the norm, thus becoming what Kristeva terms "the one by whom the abject exists," or "the deject" people."Powers of Horror", p. 8. Institutions and organizations typically rely on rituals and other structural practices to protect symbolic elements from the semiotic, both in a grander organizational focus that emphasizes the role of policy-making, and in a smaller interpersonal level that emphasizes social rejection. Both the organizational and interpersonal levels produce a series of exclusionary practices that create a "zone of inhabitability" for staff perceived to be in opposition to the organizational norms.

One such method is that of "collective instruction," which refers to a strategy often used to defer, render abject and hide the inconvenient "dark side" of the organization, keeping it away from view through corporate forces.Sorenson, "Changing the memory of suffering: An organizational aesthetics on the dark side" (2014), p. 281–3. This is the process by which an acceptable, unified meaning is createdfor example, a corporation's or organization's mission statement. Through the controlled release of information and belief or reactionary statements, people are gradually exposed to a firm's persuasive interpretation of an event or circumstance, that could have been considered abject. This spun meaning developed by the firm becomes shared throughout a community. That event or circumstance comes to be interpreted and viewed in a singular way by many people, creating a unified, accepted meaning. The purpose such strategies serve is to identify and attempt to control the abject, as the abject ideas become ejected from each individual memory.

Organizations such as hospitals must negotiate the divide between the symbolic and the semiotic in a unique manner.Risq, "States of Abjection" (2013), p. 1279. Nurses, for example, are confronted with the abject in a more concrete, physical fashion due to their proximity to the ill, wounded and dying. They are faced with the reality of death and suffering in a way not typically experienced by hospital administrators and leaders. Nurses must learn to separate themselves and their emotional states from the circumstances of death, dying and suffering they are surrounded by. Very strict rituals and power structures are used in hospitals, which suggests that the dynamics of abjection have a role to play in understanding not only how anxiety becomes the work of the health team and the organization, but also how it is enacted at the level of hospital policy.

In sociological studies The abject is a concept that is often used to describe bodies and things that one finds repulsive or disgusting, and in order to preserve one's identity they are cast out. Imogen Tyler"Revolting subjects: Social abjection and resistance in neoliberal Britain" (2013), p. 599 sought to make the concept more social in order to analyze abjection as a social and lived process and to consider both those who abject and those who find themselves abjected, between representation of the powerful and the resistance of the oppressed. Tyler conducted an examination into the way that contemporary Britain had labelled particular groups of peoplemostly minority groupsas revolting figures, and how those individuals revolt against their abject identity, also known as marginalization, stigmatizing and/or social exclusion.