1often eonsAn indefinite and very long period of time.‘he reached the crag eons before I arrived’
number of years, lifetime, duration, length of life
- ‘his eyes searched her face for what seemed like eons’
- 1.1Astronomy Geology A unit of time equal to a thousand million years.
- 1.2Geology A major division of geological time, subdivided into eras.
- ‘the Precambrian eon’
(in Neoplatonism, Platonism, and Gnosticism) a power existing from eternity; an emanation or phase of the supreme deity.
Late 16th century (in eon (sense 2)): via ecclesiastical Latin from Greek aiōn ‘age’.