an extremely plentiful or oversufficient quantity or supply

an abundance of grain.

overflowing fullness

abundance of the heart.

affluence; wealth

the enjoyment of abundance.

Physics, Chemistry . the number of atoms of one isotope of an element divided by the total number of atoms in a mixture of the isotopes.

noun

dearth , deficiency , inadequacy , lack , poverty , scarcity

noun

affluence , ampleness , bounty , copiousness , fortune , myriad , opulence , plenitude , plenty , plethora , profusion , prosperity , prosperousness , riches , thriving , wealth , mass , mountain , much , world , bounteousness , bountifulness , plenteousness , amplitude , copiosity , cornucopia , excess , exuberance , fullness , luxuriance , magnitude , oodles , overflow , pleonasm , prodigality , repletion , satiety , store , sufficiency , surplus