gr. ἐνέργεια, enérgeia: funcionamento, atividade, ato, atualização, atualidade, realização. O ser em ato reside segundo Plotino  , no composto, a saber na estátua de cobre, por exemplo, posto que o cobre resta o que é tanto antes da produção da estátua como após sua realização, é portanto a estátua que é o ser em ato, e não o cobre. gr. energeiai = em ato.

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Plotino afirma, claramente, que o Uno é ato – enérgeia: “Não devemos temer de pô-lo (o Uno) como ato primeiro (proten energeian)” [En. VI, 8, 20, 10 e 15]. [Ullmann  :39]

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Ἐνέργεια is perhaps the most fundamental being-character in Aristotle  ’s doctrine of being. It contains the root word ἔργον. We will go back from ἐνέργεια to the ἔργον, and ask: What is the ἔργον of human beings, the “genuine achievement” and the “concern” in which human beings as human beings live in their being-human. From there, we will read off the mode of its being, since every ἔργον has, as ἔργον, a definite limitation that is in accordance with its being. Its πέρας is constituted by its ἀγαθóν (not value!). From this ἀγαθóν, as the πέρας, we are led to the distinctive limit that is determined as κίνησις. The limit of such a being is τέλος. We are led to the determination of εὐδαιμονία as this τέλος, to the determination of that which beings with the character of life carry within themselves as their basic possibility. [Heidegger  , GA18:43]

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Ἐνέργεια is a character of those beings that are ensouled, that are in the mode of being in a world. [Heidegger, GA18:103]

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LÉXICO: ENERGEIA