Retroaction (Fr. après coup) - These terms refer to the way that, in the psyche, present events affect past events a posteriori, since the past exists in the psyche only as a set of memories which are constantly being reworked and reinterpreted in the light of present experience.
Lacan’s term après coup is the term used by French analysts to translate Freud’s Nachträglichkeit (which the Standard Edition renders ‘deferred action’). These terms refer to the way that, in the psyche, present events affect past events a posteriori, since the past exists in the psyche only as a set of memories which are constantly being reworked and reinterpreted in the light of present experience. What concerns psychoanalysis is not the real past sequence of events in themselves, but the way that these events exist now in memory and the way that the patient reports them. Thus when Lacan argues that the aim of psychoanalytic treatment is ‘the complete reconstitution of the subject’s history’ (S1, 12), he makes it clear that what he means by the term ‘history’ is not simply a real sequence of past events, but ‘the present synthesis of the past’ (S1, 36). ‘History is not the past. History is the past in so far as it is historicised in the present’. Hence the pregenital stages are not to be seen as real events chronologically prior to the genital stage, but as forms of Demand which are projected retroactively onto the past. Lacan also shows how discourse is structured by retroaction; only when the last word of the sentence is uttered do the initial words acquire their full meaning.
Evans, Dylan. An Introductory Dictionary of Lacanian Psychoanalysis. Routledge. 1996.










