- an indefinitely long period of time; age.
- the largest division of geologic time, comprising two or more eras.
- Astronomy. one billion years.
Origin of eon
Examples from the Web for eon
Bush ran his last competitive race in 1998, an eon ago in political terms.Why We Can’t Quit Bush and Clinton
March 25, 2014
And in an eon of lying they never have run up against a short-circuit like that.Letter of the Law
Alan Edward Nourse
Every hour of Earth is an eon and her day has yet many hours.The Masque of the Elements
Only once in an eon or so is it vouchsafed a writer to write a masterpiece at the age of nine years.Daisy Ashford: Her Book
Lunch, lunsh, n. a slight repast between breakfast and dinner—also Lunch′eon.
The cases of Tanchelm and Eon are no doubt cases of simple religious mania.Medival Heresy and the Inquisition
A. S. Turberville
- the usual US spelling of aeon
- geology the longest division of geological time, comprising two or more eras
Word Origin and History for eon
1640s, from Latin aeon, from Greek aion "age, vital force, a period of existence, lifetime, generation;" in plural, "eternity," from PIE root *aiw- "vital force, life, long life, eternity" (cf. Sanskrit ayu "life," Avestan ayu "age," Latin aevum "space of time, eternity," Gothic aiws "age, eternity," Old Norse ævi "lifetime," German ewig "everlasting," Old English a "ever, always").
- The longest division of geologic time, containing two or more eras.