Eon
name, noun, slang ·Common ·High school level
Definitions
- 1 Eternity, the duration of the universe.
- 2 (Gnosticism) a divine power or nature emanating from the Supreme Being and playing various roles in the operation of the universe wordnet
- 3 An immeasurably or indefinitely long period of time.
- 4 an immeasurably long period of time wordnet
- 5 A long period of time. US, excessive, informal
"It’s been eons since we last saw each other."
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- 6 the longest division of geological time wordnet
- 7 A period of one billion (short scale, i.e. 1,000,000,000) years.
"We live our lives in three dimensions for our threescore and ten allotted years. Yet every branch of contemporary science, from statistics to cosmology, alludes to processes that operate on scales outside of human experience: the millisecond and the nanometer, the eon and the light-year."
- 8 The longest geochronologic unit, being a period of hundreds of millions of years; subdivided into eras.
- 9 A spirit being emanating from the Godhead.
- 1 The Greek National Organisation of Youth, similar to the Hitler Youth. It was formed before WWII and disbanded in 1941.
Antonyms
All antonymsExample
More examples"Then about 2.3 to 2.5 billion years ago, during the Proterozoic Eon, blue-green algae called cyanobacteria, living in Earth’s shallow oceans, began emitting enough oxygen through photosynthesis to create the permanently oxygenated atmosphere that keeps us alive today."
Etymology
From Latin aeon, from Ancient Greek αἰών (aiṓn, “age, era”).
From Greek ΕΟΝ (EON), short for Εθνική Οργάνωση Νεολαίας.
Related phrases
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Data sourced from Wiktionary, WordNet, CMU, and other open linguistic databases. Updated March 2026.