1. the numbers of elements in sets; measures of the sizes of mathematical sets
Usage: mathematics; plural of cardinality

Examples

• The cardinalities of the two sets were equal, both containing five elements.
• Mathematicians compare cardinalities to determine which infinite sets are larger.
• The cardinalities of finite sets are simply their element counts.
• Different cardinalities exist among infinite sets, such as countable and uncountable infinities.
• Students learned to calculate cardinalities using various counting techniques.
• The cardinalities of these databases vary significantly in size.