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An entity is something that exists as itself, as a subject or as an object, actually or potentially, concretely or abstractly, physically or not. It need not be of 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, or present.
The word entitative is the adjective form of the noun entity. Something that is entitative is considered in its own right.
Ontology is the study of being, existence and the recognition of entities. The words ontic and entity are derived respectively from the ancient Greek and Latin present participles that mean "being".
In medicine, a disease entity is an illness due to a particular definite cause or to a specific pathological process. While a disease entity is not defined by a syndrome, it may or may not be manifest in one or more particular syndromes.