noun, plural entities.
something that has a real existence; thing: corporeal entities.
being or existence, especially when considered as distinct, independent, or self-contained: He conceived of society as composed of particular entities requiring special treatment.
essential nature: The entity of justice is universality.

1590–1600; < Medieval Latin entitās, equivalent to enti- (stem of ēns), present participle of esse to be + -tās -ty2

entitative [en-ti-tey-tiv] , adjective
entitatively, adverb
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World English Dictionary
entity (ˈɛntɪtɪ)
n , pl -ties
1.  something having real or distinct existence; a thing, esp when considered as independent of other things
2.  existence or being
3.  the essence or real nature
[C16: from Medieval Latin entitās, from ēns being; see ens]

Collins English Dictionary - Complete & Unabridged 10th Edition
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Word Origin & History

1596, from M.L. entitatem (nom. entitas), from L. ens (gen. entis), proposed by Caesar as prp. of esse "be" (see is), to render Gk. philosophical term to on "that which is."
Online Etymology Dictionary, © 2010 Douglas Harper
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Computing Dictionary

entity definition

In an entity-relationship model, an entity is a type of thing being modeled such as "person" or "product". Different entities have different sets of attributes such as "name" or "price" and are connected via relationships like "bought". Entities are closely related to classes (class).
The Free On-line Dictionary of Computing, © Denis Howe 2010 http://foldoc.org
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Example sentences
Apparently that weather we had last week wasn't such a non-entity.
We will evolve as a separate entity under one umbrella.
It is a new type of biological entity never before seen in nature.
Anytime a corporation see another entity with a name similar to it's own they
  will file a suit.
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