eon

1. Eternity, the duration of the universe.
2. An immeasurably or indefinitely long period of time.
3. A long period of time. (US, informal) · It’s been eons since we last saw each other.
4. A period of one billion (short scale, i.e. 1,000,000,000) years; a gigayear.
5. The longest geochronologic unit, being a period of hundreds of millions of years; subdivided into eras.
6. A spirit being emanating from the Godhead.

الجمع eons