The term defunct refers to something that is no longer in use, functioning or operational. It can be applied to a variety of things such as organizations, businesses, systems, technologies and even relationships. When an organization or business ceases operations and is no longer active, it is often referred to as being defunct. Similarly, when a system, technology or relationship stops working or is no longer in use, they are also considered defunct. The term can be used both positively or negatively depending on the context - for example, an old company that has been replaced by a new one could be seen as defunct, while an outdated method of doing something may still be useful and relevant even if it is no longer in use.