Ingression is Alfred North Whitehead’s term for the way an eternal object participates in an actual occasion. An eternal object does not exist the way an occasion does — it does not arise, concresce, and perish. It subsists as a pure potential. Ingression is the realization of that potential: the eternal object becomes an ingredient in a particular occasion’s concrescence, contributing a determinate quality, pattern, or form to the occasion’s achieved character.
The term is chosen to replace both “instantiation” (which implies a universal imposed on passive matter) and “exemplification” (which implies an abstract pattern merely illustrated by a concrete case). Ingression is a relational act: the eternal object acquires a specific mode of definiteness through its participation in a particular occasion, and the occasion acquires a specific character through its integration of that eternal object. Neither exists in its realized form apart from the other.
An eternal object’s ingression is mediated by conceptual prehension — the grasping of a possibility — and shaped by the occasion’s subjective aim. The occasion does not passively receive whatever eternal objects happen to be available; it selects among them, valuing some positively and excluding others through negative prehension. The pattern of ingression and exclusion is what gives the occasion its unique qualitative character.
Each eternal object has a relational essence: the way its ingression into one context conditions its possible ingression into others. This relational essence connects ingression to the formal structures of this research program. The typed operators of the semiotic universe model a structurally analogous process: the realization of abstract possibilities within concrete semiotic contexts.
Related terms
- Eternal object — the potentials that ingress
- Actual occasion — the occasions into which eternal objects ingress
- Concrescence — the process during which ingression occurs
- Prehension — conceptual prehension mediates ingression
- Subjective aim — guides the selection of which eternal objects ingress