An entity is something that exists in itself, actually or hypothetically. 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.
Sometimes, the word entity is used in a general sense of a being, whether or not the referent has material existence, e.g., is often referred to as an entity with no corporeal form (non-physical entity), such as a language. It is also often used to refer to ghosts and other spirits.
The word entitative is the adjective form of the noun entity. Something that is entitative is "considered as pure entity; abstracted from all circumstances", that is, regarded as entity alone, apart from attendant circumstances.
A DBMSentity is either a thing in the modeled world or a drawing element in an ERD.
In SUMO, Entity is the root node and stands for the universal class of individuals.
In VHDL, entity is the keyword for defining a new object.
An SGMLentity is an abbreviation for some expanded piece of SGML text.