en·ti·ty 
(ĕntĭ-tē)
(ĕntĭ-tē)n. pl. en·ti·ties
1. Something that exists as a particular and discrete unit: Persons and corporations are equivalent entities under the law.
2. The fact of existence; being.
3. The existence of something considered apart from its properties.
[Medieval Latin entitās, from Latin ēns, ent-, present participle of esse, to be; see es- in the Appendix of Indo-European roots.]