(Used in the Aristotelian sense; Fârâbî argues the First Being has no potentiality.)
The capacity of a being to possess a predicate or property it does not currently possess by its essence, requiring actualization by something external that already has that property.
Proclean henology(as used in metaphysics and ancient philosophy)
A philosophical system developed by the ancient thinker Proclus that focuses on 'the One'—a single, ultimate source of all reality from which everything else flows.
actuality(Contrasted with non-actuality; ceasing to be actual is equated with death and the loss of all distinctively human properties)
The state of being actual (as opposed to merely possible), associated with consciousness, embodiment, and lived human properties
essence(Medieval realist metaphysics)
The defining nature of a species, held by some to be distinct from and capable of surviving the destruction of all individual members of that species