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.
EOD. Acronym for End of Day used by colleagues of office spaces to conclude their day. A typical EOD should be initiated half an hour before the end of the workday. Preferably an EOD is initiated using an online messenger service such as MSN or Gtalk.