1 Simple molecules [molecule: A molecule is a collection of two or more atoms held together by chemical bonds. 2  It is the smallest part of a substance that displays the properties of the substance.
Eon has a number of meanings. In Astronomy, an eon refers to 1 billion (109) years. But it also refers to a very long, unspecified period of time, or specific geologic stages of the Earth.
aeon. 1. a period of one thousand million years. 2.Gnosticism one of the powers emanating from the supreme being and culminating in the demiurge.eon. 1. a period of one thousand million years. 2.