The quality or state of being abundant; great plenty or copiousness.
From 'abundant' (Latin 'abundans') + '-cy' (suffix forming abstract nouns); a near-synonym to 'abundance,' slightly more formal or archaic.
In mathematics and computing, 'abundant' has a special meaning—an 'abundant number' is one where the sum of its divisors exceeds the number itself, showing how technical fields repurpose common words.
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