Entity An entity is something that has 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 is also no presumption that an entity is animate. Entities are used in system developmental models that display communications and internal processing of, say, documents compared to order processing. Wiki This modern defintion removes the historical connections to being as animate in the verb sum, esse via ens and entitas. In an Entity Relationship Model, Entity means EntityType or Component.