Abundance n. : An overflowing fullness; ample sufficiency; great plenty; profusion; copious supply; superfluity; wealth: -- strictly applicable to quantity only, but sometimes used of number.

Example:
How has the Abundance of hydrogen changed in the universe since the Big Bang?

Taxonomy
Abundance, free encyclopedia, elements, Abundance of the chemical elements, chemistry, Natural abundance, search, free dictionary, scarcity, representation, species, computer programming language, substance, reaction, quantities, measure, prevalence, isotopes.

Defination from the web:
Abundance (ecology), the relative representation of a species in a community. Abundance (programming language), a Forth-like computer programming language ... Abundance (chemistry), when a substance in a reaction is present in high quantities. Abundance of the chemical elements, a ...