Full Idea
Potentiality [dunamis] is a principle of change either (a) for something else or (b) for the thing that it is in qua something else.
Gist of Idea
Potentiality is a principle of change, in another thing, or as another thing
Source
Aristotle (Metaphysics [c.324 BCE], 1046a10)
Book Reference
Aristotle: 'Metaphysics', ed/tr. Lawson-Tancred,Hugh [Penguin 1998], p.254
A Reaction
Gill emphasises that it is partly an active principle of change. It seems like an ability to affect, or to be affected.
Related Ideas
Idea 16114 Active 'dunamis' is best translated as 'power' or 'ability' (rather than 'potentiality') [Aristotle, by Gill,ML]
Idea 16118 Nature is an active principle of change, like potentiality, but it is intrinsic to things [Aristotle]