Full Idea
What is a principle of change or process is said to be a 'potentiality' [dunamis], whether in something else or in the thing itself qua something else.
Clarification
'qua' means 'as'
Gist of Idea
A 'potentiality' is a principle of change or process in a thing
Source
Aristotle (Metaphysics [c.324 BCE], 1019a18)
Book Reference
Aristotle: 'Metaphysics', ed/tr. Lawson-Tancred,Hugh [Penguin 1998], p.131