1. that which is perceived or known or inferred to have its own distinct existence (living or nonliving)
The Collaborative International Dictionary of English v.0.48:
Entity \En"ti*ty\, n.; pl. Entities. [LL. entitas, fr. L. ens,
entis, thing, prop. p. pr. of esse to be: cf. F. entit['e].
See Essence, Is.]
A real being, whether in thought (as an ideal conception) or
in fact; being; essence; existence.
Self-subsisting entities, such as our own personality.
Fortune is no real entity, . . . but a mere relative
WordNet (r) 3.0 (2006):
n 1: that which is perceived or known or inferred to have its
own distinct existence (living or nonliving)
Moby Thesaurus II by Grady Ward, 1.0:
47 Moby Thesaurus words for "entity":
an existence, article, being, body, creature, critter, ens,
entelechy, esse, essence, existence, existent, individual, integer,
integral, integrate, item, life, material, materiality, matter,
module, monad, object, occurrence, organism, person, persona,
personality, point, presence, quantity, quiddity, quintessence,
single, singleton, something, soul, stuff, subsistence, substance,
substantiality, sum, system, thing, totality, unit
The Free On-line Dictionary of Computing (30 December 2018):
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).