Ontology

In Lacan's usage in Seminar XX (as read by Bruce Fink), "Ontology" does not name a neutral philosophical discipline but a specific ideological operation performed within language: the isolation and hypostatization of the copula "to be" as though it were itself a signifier with stable referential weight. Lacan's move is to expose ontology as a symptom of the master's discourse — a discourse that conceals its own division ($) beneath an apparent unity of command (S1). By elevating "to be" into a substantive term, ontology performs precisely the illegitimate move the master's discourse always performs: it installs a commanding signifier that appears to ground being, while suppressing the structural fact that no signifier can bear that weight without remainder. The copula is, in this reading, a signifier among signifiers — barred like all others — yet ontology treats it as if it anchored presence itself.

This critique is embedded in Lacan's broader distinction between the letter (l'écrit) and the signifier. Letters — mathemes such as $, a, A — name loci and functions without claiming to represent being; they are indifferent to the ontological register. Ontology, by contrast, tries to extract from language something language cannot deliver: a guarantee of being. The "highly risky enterprise" of producing the verb "to be" as such is risky precisely because it invites the confusion of the symbolic order's structural void (the barred Other, S(Ø)) with a positive ground. Where analytic discourse works against this temptation by placing the opaque object a in the position of agent rather than a master signifier, ontology works in the opposite direction — suturing the gap that the barred subject and barred Other structurally maintain.

This concept appears once, in jacques-lacan-seminar-20-bruce-fink (p.40), at a moment in Seminar XX when Lacan is distinguishing the register of writing (l'écrit) and the letter from that of the signifier. It functions as a negative anchor: ontology names what analytic discourse — and the letter/matheme specifically — must not do. Its primary cross-reference is the Discourse of the Master: ontology is effectively the philosophical form that master's discourse takes when it migrates into epistemology, naturalising the copula "to be" just as S1 naturalises its own command by concealing the divided subject ($) in the position of truth. The concept is also implicated in the structure of the Barred Other: ontology's error is precisely to un-bar the Other, to pretend that language can anchor being without remainder, when the whole of Lacanian theory insists that S(Ø) — the signifier of the lack in the Other — is irreducible.

In relation to the Four Discourses and the Discourse of the Analyst, this critique of ontology positions analytic discourse as structurally anti-ontological: rather than installing a master signifier that claims to ground being, the analyst's discourse places the opaque, falling objet petit a in the commanding position, explicitly refusing the gesture of hypostatization. The concept also touches on Language and the Letter: where the letter (matheme) is indifferent to being and names functions rather than essences, ontology is the attempted capture of being from within language — a capture the barred subject and the barred Other structurally forbid. In this sense, the concept of Ontology in Seminar XX operates as a critical foil, a name for the philosophical temptation that the apparatus of the four discourses and the matheme are designed to circumvent.

Seminar XX · Encore: On Feminine Sexuality, the Limits of Love and KnowledgeJacques Lacan · 1972 (p.40)

Ontology is what highlighted in language the use of the copula, isolating it as a signifier. To dwell on the verb 'to be'… to produce it as such is a highly risky enterprise.

The phrase "isolating it as a signifier" is theoretically loaded: it identifies ontology's move as a signifying operation — a singling-out of the copula from the chain — while simultaneously implying that this isolation is illegitimate, since no signifier can be produced "as such" without the constitutive relation to other signifiers that bars it. The qualifier "highly risky enterprise" performs the Lacanian warning that treating "to be" as though it could anchor presence exposes the speaker to the void the copula is meant to conceal.