Eon is the abbreviation of the English word "aeon", which is often used in American English and technical terms. Aeon has four meanings: (1) "extremely long period"; (2) "Billion years" in astronomy and geology; (3) Geologically, it also refers to a complete "geological period" and then divided into "times"; (4) Philosophically, it refers to a kind of "power" that exists outside of time and is obtained from super-divinity. Aeon comes from the Greek word "Aion", which means "age" and "age".

Eon (or aeon) is pronounced [‵i:? n].