Cardinalities

cardinality

[kahr-dn-al-i-tee]
noun, plural cardinalities. Mathematics.
(of a set) the cardinal number indicating the number of elements in the set.

Origin:
1930–35; cardinal + -ity

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World English Dictionary
cardinality (ˌkɑːdɪˈnælɪtɪ)
 
n
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

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Etymonline
Word Origin & History

cardinality
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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