Abundance

• the property of a more than adequate quantity or supply; "an age of abundance"
• (physics) the ratio of the number of atoms of a specific isotope of an element to the total number of isotopes present
• (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
• Abundance is an ecological concept referring to the relative representation of a species in a particular ecosystem. It is usually measured as the mean number of individuals found per sample.
• number per unit area.
• the size of a salmonid population or of a component of the population expressed as numbers of fish.
• any measure of the amount of an organism. Can include density, biomass, frequency, cover, presence/absence, etc. See species abundances in ordination.
• the amount of a molecule relative to other molecules
• a population estimate relative to area.