Energeia

Energeia is an important Greek technical term in the works of Aristotle. The two components of his coinage indicate something being "in work". It is the etymological source of the modern word "energy" but the term has evolved so much during Western History that this link is no longer helpful in understanding the original Aristotelian term.

Many translators into English appear to make no effort to find one single English word for energeia in their translations. One American scholar, Joe Sachs, attempts to translate it literally as a "being at work," although most frequently terms derived from Latin translations like activity and actuality are used, attempting to give the sense of something which is more than just potentially existent.

... Energeia (energy) was invoked as the protector of the ephemeral Free State of Fiume (Croatia, 1920-1924) by Italian poet and war hero Gabriele D'Annunzio, who also called it "the tenth Muse" in the constitution he drafted for it .

Source: Wikipedia - www.wikipedia.org