In term, ergon (TR:12) (LH:3) (TL:15), Greek εργον (NE:228), meaning, work, labor, or great work; from "erga" (Homer, 800BC), Greek εργα (NE:109), meaning: air, mist, cloud, or Hera (Greek mythology).
The term "ergon" tends to be attributed to the publications of Heraclitus (aka Hera-clitus); then later employed by Aristotle as an energon to energeia (ενέργεια) synonym. There, however, seems to be some lost hidden etymological meaning in this term, e.g. in respect to flux, fire, and work?
The following are related quotes:
- “We might call S the ‘transformation content’ of the body, just as we termed the magnitude U its ‘thermal’ and ‘ergonal’ content. But as I hold it to be better terms for important magnitudes from the ancient languages, so that they may be adopted unchanged in all modern languages, I propose to call the ‘magnitude’ S the entropy of the body, from the Greek words words η [in or the] + τροπή, meaning in ‘transformation’. I have intentionally formed the word ‘entropy’ so as to be as similar as possible to the word ‘energy’; for the two magnitudes to be denoted by these words are so nearly allied their physical meanings, that a certain similarity in designation appears to be desirable.”
- — Rudolf Clausius (1865), Mechanical Theory of Heat (pg. 357)
- “Ergon: work, job, deed, task. An ergon in Greek (compare English ‘energy’) can refer to anything done or made—to works of art and deeds of war. It can be someone's job or business. It may, but need not, imply something laborious. Ergon as deed is often opposed to logos or speech. Socrates plays on this duality throughout his long speech (at 19B ff). The word parergon (from para, beside or alongside of, and ergon) appears several times in the dialogue and has been rendered ‘side-job’ (see: craftsman).”
- — Peter Kalkavage (2015), “Glossary” to Plato’s Timaeus (pg. 147) 
- Ergon – Hmolpedia 2020.