Definition of "supereon"

supereon

noun
plural supereons
1. (geology) A time period encompassing more than one eon, principally used to characterize the Precambrian.
  Quotations
  Sometimes the Hadean, Archean and Proterozoic are lumped together in a supereon called the Precambrian.
  2015, Charles S. Cockell, Astrobiology: Understanding Life in the Universe, page 254