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.

1300–50; Middle English < Middle French < Latin abundantia. See abundant, -ance

preabundance, noun

abundance, plenty, profusion (see synonym study at plenty).

1. copiousness, plenteousness. See plenty. 2. generosity.

1. scarcity.
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Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
abundance (əˈbʌndəns)
1.  a copious supply; great amount
2.  fullness or benevolence: from the abundance of my heart
3.  degree of plentifulness
4.  chem the extent to which an element or ion occurs in the earth's crust or some other specified environment: often expressed in parts per million or as a percentage
5.  physics the ratio of the number of atoms of a specific isotope in a mixture of isotopes of an element to the total number of atoms present: often expressed as a percentage: the abundance of neon-22 in natural neon is 8.82 per cent
6.  Also called: abondance a call in solo whist undertaking to make nine tricks
7.  affluence
[C14: via Old French from Latin abundantia, from abundāre to abound]

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
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Word Origin & History

mid-14c., from O.Fr. abundance (Mod.Fr. abondance), from L. abundantia "fullness," noun of state from abundans (gen. abundantis), prp. of abundare "to overflow" (see abound).
Online Etymology Dictionary, © 2010 Douglas Harper
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Example sentences
Today our animal protein is raised on feedlots and in cages and delivered in
  great abundance nearly to our door.
However, these mangroves are important to the local fishing industry,
  particularly for their abundance of crabs.
Even though the temperature change was quite small, its effect on mosquito
  abundance was quite large.
Hard data is in abundance but closed minds are in super abundance.
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