Definition of entity noun from the Oxford Advanced Learner's Dictionary

  

entity

 noun
noun
BrE BrE//ˈentəti//
 
; NAmE NAmE//ˈentəti//
 
(pl. entities)(formal)
 
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something that exists separately from other things and has its own identity The unit has become part of a larger department and no longer exists as a separate entity. These countries can no longer be viewed as a single entity. Word Origin late 15th cent. (denoting a thing's existence): from French entité or medieval Latin entitas, from late Latin ens, ent- ‘being’ (from esse ‘be’).Extra examples Church and empire were fused in a single entity. The two companies will combine to form a new entity. Each subsidiary of the company will be treated as a single entity. The unit has become part of a larger department and no longer exists as a separate entity.
See the Oxford Advanced American Dictionary entry: entity