Cardinality meaning

A quantity relationship between elements. For example, one-to-one, one-to-many and many-to-one express cardinality. See cardinal number.
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(set theory) Of a set, the number of elements it contains.

The empty set has a cardinality of zero.

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(data modeling) 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.
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Origin of cardinality