The definition of an entity is something that exists independently.
(noun)An example of entity is a state or province that breaks away from the rest of the country.
See entity in Webster's New World College Dictionary
See entity in American Heritage Dictionary 4
noun pl. en·ti·ties
Origin:
Origin: Medieval Latin entitās
Origin: , from Latin ēns, ent-
Origin: , present participle of esse, to be; see es- in Indo-European roots
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