Definition
Replaceability refers to the quality of being easily substituted or exchanged for something else. It implies that an item or person is not unique or indispensable. Think of interchangeable parts in a machine; if one breaks, you simply swap it out. Replaceability often depends on how common the skills or resources are. A star athlete might seem irreplaceable, but even they can be succeeded by new talent. It highlights the expendable nature of certain roles or objects. Basically, anything you can easily get a substitute for has high replaceability.