In telecommunication, an interchangeability is a condition which exists when two or more items possess such functional and physical characteristics as to be equivalent in performance and durability, and are capable of being exchanged one for the other without alteration of the items themselves, or of adjoining items, except for adjustment, and without selection for fit and performance.
In computer science, interchangeability is an ability that an object can be replaced by another object without affecting code using the object. That chance usually requires two objects share an interface that is either same strictly or compatible in particular case. See encapsulation article for detail.
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