noun, plural cardinalities. Mathematics.
(of a set) the cardinal number indicating the number of elements in the set.

1930–35; cardinal + -ity Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
cardinality (ˌkɑːdɪˈnælɪtɪ)
1.  maths the property of possessing a cardinal number
2.  maths, logic (of a class) the cardinal number associated with the given class. Two classes have the same cardinality if they can be put in one-to-one correspondence

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009
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Word Origin & History

1520s, "condition of being a cardinal," from cardinal (q.v.) + -ity. Mathematical sense is from 1935.
Online Etymology Dictionary, © 2010 Douglas Harper
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