cardinality

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English[edit]

Etymology[edit]

cardinal +‎ -ity

Noun[edit]

cardinality (plural cardinalities)

  1. (set theory) Of a set, the number of elements it contains.
    The empty set has a cardinality of zero.
    • 2005 April 24, Johan de Jong, “Set Theory”, in The Stacks Project[1], retrieved 2018-2-26:
      The cardinality of a set A is the least ordinal α such that there exists a bijection between A and α. We sometimes use the notation to indicate this.
  1. (data modeling, databases) The property of a relationship between a database table and another one, specifying whether it is one-to-one, one-to-many, many-to-one, or many-to-many.
  2. (religion) The status of a cardinal

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