aeon

Other forms: aeons

Definitions of aeon

1. noun

   the longest division of geological time
   synonyms: eon

   examples:

   Phanerozoic aeon

   the current geologic eon, starting about 541 million years ago

   Precambrian period

   the vast span of geologic time before the Phanerozoic eon, from Earth's formation about 4.6 billion years ago to about 541 million years ago

   Proterozoic aeon

   the third eon of geologic time, from about 2.5 billion to 541 million years ago

   Archaeozoic aeon

   the second eon of geologic time, from about 4.0 to 2.5 billion years ago

   Priscoan aeon

   the first eon of geologic time, beginning with the formation of Earth approximately 4.6 billion years ago and ending about 4.0 billion years ago

   type of:

   geologic time, geological time

   the time of the physical formation and development of the earth (especially prior to human history)
2. noun

   an immeasurably long period of time
   synonyms: eon

   type of:

   age, long time, years

   a prolonged period of time
3. noun

   (Gnosticism) a divine power or nature emanating from the Supreme Being and playing various roles in the operation of the universe
   synonyms: eon

   type of:

   spiritual being, supernatural being

   an incorporeal being believed to have powers to affect the course of human events