Maximum cardinality indicates whether or not an instance of one entity class must be related to at least one instance of another entity class.

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Quizplus · Accepted Answer

Maximum cardinality actually indicates the maximum number of instances of one entity that can be associated with a single instance of another entity. The concept you're describing is more closely related to minimum cardinality, which determines if an instance of one entity class must be related to at least one instance of another entity class.

Maximum Cardinality Indicates Whether or Not an Instance of One