1. the number of elements in a mathematical set
Usage: mathematics; set theory
2. the property of being countable or having a specific number
Usage: formal; mathematics

Examples

• The cardinality of the set {1, 2, 3, 4} is four.
• In database design, cardinality describes the relationship between tables.
• The cardinality of an infinite set can be difficult to comprehend.
• Students learned to determine the cardinality of various mathematical sets.
• The cardinality of the empty set is zero.
• Comparing the cardinality of different sets helps understand their relative sizes.