English
ergoregion
From ergo- + region.
Proto-Indo-European *werǵ- ‘to make’
Proto-Indo-European *wérǵom ‘work’
Proto-Hellenic *wérgon ‘work’
Ancient Greek ἔργον ‘work or deed of war’
English ergo-
Proto-Indo-European *h₃reǵ- ‘to straighten’
…
Latin regō ‘to rule’
Latin regiō ‘direction’
Anglo-Norman regiun
Middle English regioun ‘a realm’
English region
Today it means
noun ergosphere
Language periods are conventional ranges, not dates for this word.
Etymograph / ergoregion