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.]
The American Heritage® Dictionary of the English Language, Fifth Edition copyright ©2019 by Houghton Mifflin Harcourt Publishing Company. All rights reserved.
Indo-European & Semitic Roots Appendices
Thousands of entries in the dictionary include etymologies that trace their origins back to reconstructed proto-languages. You can obtain more information about these forms in our online appendices:
The Indo-European appendix covers nearly half of the Indo-European roots that have left their mark on English words. A more complete treatment of Indo-European roots and the English words derived from them is available in our Dictionary of Indo-European Roots.