Eon Definition
 ēən, ēän 
  eons
  
    noun
  
 
    eons
  
An extremely long, indefinite period of time; thousands and thousands of years.
 Webster's New World 
The major unit of geologic time, usually subdivided into eras.
 Webster's New World 
A billion years.
 Webster's New World 
(US) Eternity.
Wiktionary 
    abbreviation
  
 (politics) ΕΟΝ, the Greek National Organisation of Youth similar to the Hitler Youth, it was formed before WWII and disbanded in 1941.
 Wiktionary 
Other Word Forms of Eon
Noun
Singular:
 eonPlural:
 eonsOrigin of Eon
-  
Late Latin aeōn from Greek aiōn aiw- in Indo-European roots
From American Heritage Dictionary of the English Language, 5th Edition
 From Ancient Greek αἰών (aiōn, “age”).
From Wiktionary
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