1.Definition: (chemistry) the ratio of the total mass of an element in the earth's crust to the total mass of the earth's crust; expressed as a percentage or in parts per million

Category: General

2.Definition: (physics) the ratio of the number of atoms of a specific isotope of an element to the total number of isotopes present

Category: General

3.Definition: the property of a more than adequate quantity or supply

"An age of abundance"

Related Noun(s):copiousness

Category: General