noun

• (set theory, of a set) The number of elements a given set contains.
• (type theory) The number of terms that can inhabit a type; the possible values of a type.
• (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.
• (religion) The status of being cardinalitial