In mathematics, the quality or property of being denumerable; the ability to be counted or put in one-to-one correspondence with natural numbers.
From denumerable (countable) + -ity (quality or state). Mathematical term from the late 19th century, combining de- + numerable + -ity.
This is a fascinating math concept: infinite sets like integers and rational numbers have denumerability, meaning they can be counted even though they're infinite—Georg Cantor proved some infinities are 'bigger' than others!
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