one-to-many

A one-to-many mapping from X to Y.

Meaning

Having the property that the same argument may yield multiple values, but different arguments never yield the same value.
having the property that an element of one set may be assigned by the relationship to several elements in the other set, but that a given element in the second set can have only one member of the first set assigned to it.
From a single source to multiple recipients.

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