Definition of eon in English:


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(mainly British aeon)
  • 1often eonsAn indefinite and very long period of time.

    ‘he reached the crag eons before I arrived’
    • ‘his eyes searched her face for what seemed like eons’
    number of years, lifetime, duration, length of life
    1. 1.1Astronomy Geology A unit of time equal to a thousand million years.
    2. 1.2Geology A major division of geological time, subdivided into eras.
      • ‘the Precambrian eon’
  • 2Philosophy
    (in Neoplatonism, Platonism, and Gnosticism) a power existing from eternity; an emanation or phase of the supreme deity.



/ˈēən/ /ˈiən/ /ˈēˌän/ /ˈiˌɑn/


Late 16th century (in eon (sense 2)): via ecclesiastical Latin from Greek aiōn ‘age’.