μεγααιώνας

Noun

 * 1)  eon

Usage notes
"Proterozoic eon" will be found translated as "Προτεροζωικός αιώνας" and "Προτεροζωικός μεγααιώνας". The form "αιώνας" can mean any long period (age, century, etc) so "μεγααιώνας" - large eon - is often used to make the meaning clear.