The philosophy of organism is a cell-theory of actuality. Each ultimate unit of fact is a cell-complex, not analyzable into components with equivalent completeness of actuality.
In the genetic theory, the cell is exhibited as appropriating for the foundation of its own existence, the various elements of the universe out of which it arises. Each process of appropriation of a particular element is termed a prehension. The ultimate elements of the universe, thus appropriated, are the already constituted actual entities, and the eternal objects. All the actual entities are positively prehended, but only a selection of the eternal objects. …
An actual entity is a process in the course of which many operations with incomplete subjective unity terminate in a completed unity of operation, termed the ‘satisfaction.’ The ‘satisfaction’ is the contentment of the creative urge by the fulfilment of its categoreal demands. ..
The process itself is the constitution of the actual entity …
The terminal unity of operation, here called the ‘satisfaction,’ embodies what the actual entity is beyond itself. In Locke’s phraseology, the ‘powers’ of the actual entity are discovered in the analysis of the satisfaction … It is the actual entity as a definite, determinate, settled fact, stubborn and with unavoidable consequences. … The satisfaction of each actual entity is an element in the givenness of the universe: it limits boundless, abstract possibility into the particular real potentiality from which each novel concrescence originates. The ‘boundless, abstract possibility’ means the creativity considered solely in reference to the possibilities of the intervention of eternal objects, and in abstraction from the objective intervention of actual entities belonging to any definite actual world, including God among the actualities abstracted from.
Alfred North Whitehead, Process and Reality