Here is a test: this a definiton of X. What is X?
Definition: The fulfillment of what exists potentialy insofar as it exists potentialy is X: namely, what is alterable qua alterable , alteration: of what can be increased and its opposite what can be decreased, increase and decrease: of what can come to be and can pass away, coming to he and passing away : of what can be carried along. Examples will elucidate this definition of X. When the buildable , in so far as it is just that, is fully real, it is being built, and this is building. Similarly, learning, doctoring, rolling, leaping, ripening, ageing.
No cheating with google. I tried to disguise it a bit but google is too clever for me; or people make too many common spelling errors.
[Update: no-one has managed to guess, or perhaps no-one has felt inclined to try very hard. I think I have too many level-headed scientist types reading my blog, I was hoping a few philosopher types would turn up and defend their hero. I will reveal the truth tomorrow -W]
[Update: so the answer is "motion". I hope you don't feel too disappointed. The author is of course Aristotle. Vast amounts of effort appear to have been expended trying to make sense of this gobbledegook; see Aristotle (384-322 BCE): Motion and its Place in Nature for example: In order to adequately understand Aristotle's definition of motion it is necessary to understand what he means by actuality and potentiality. Aristotle uses the words energeia and entelechia interchangeably to describe a kind of action. A linguistic analysis shows that, by actuality, Aristotle means both energeia, which means being-at-work, and entelechia, which means being-at-an-end. These two words, although they have different meanings, function as synonyms in Aristotle's scheme.... and so on -W]