An entity's something that's a distinct, separate existence, though it need not be a material existence. In particular, abstractions and legal fictions are usually regarded as entities. In general, there's also no presumption that an entity's animate. Entities are used in system developmental models that display communications and internal processing of, say, documents compared to order processing. An entity could be viewed as a set containing subsets. In philosophy, such sets are said to be ab… (More on Entity)