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2 definitions found
 for cardinality
From WordNet (r) 3.0 (2006) :

  cardinality
      n 1: (mathematics) the number of elements in a set or group
           (considered as a property of that grouping)

From The Free On-line Dictionary of Computing (18 March 2015) :

  cardinality
  
      The number of elements in a set.  If two sets
     have the same number of elements (i.e. there is a bijection
     between them) then they have the same cardinality.  A
     cardinality is thus an isomorphism class in the category
     of sets.
  
     aleph 0 is defined as the cardinality of the first
     infinite ordinal, omega (the number of natural
     numbers).
  
     (1995-03-29)
  

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