Usually means: Study of existence and reality.
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We found 51 dictionaries that define the word ontology:

General (25 matching dictionaries)
  1. ontology: Merriam-Webster.com
  2. ontology: Oxford Learner's Dictionaries
  3. ontology: American Heritage Dictionary of the English Language
  4. ontology: Collins English Dictionary
  5. ontology: Vocabulary.com
  6. Ontology, ontology: Wordnik
  7. ontology: Wiktionary
  8. ontology: Webster's New World College Dictionary, 4th Ed.
  9. ontology: The Wordsmyth English Dictionary-Thesaurus
  10. ontology: Infoplease Dictionary
  11. Ontology, ontology: Dictionary.com
  12. ontology: Online Etymology Dictionary
  13. Ontology (computer science), Ontology (information science), Ontology: Wikipedia, the Free Encyclopedia
  14. Ontology: Online Plain Text English Dictionary
  15. ontology: Webster's Revised Unabridged, 1913 Edition
  16. ontology: Grandiloquent Dictionary
  17. Ontology: AllWords.com Multi-Lingual Dictionary
  18. ontology: Webster's 1828 Dictionary
  19. ontology: Free Dictionary
  20. ontology: The Phrontistery - A Dictionary of Obscure Words
  21. ontology: Mnemonic Dictionary
  22. ontology: Dictionary/thesaurus
  23. ontology: Rhymezone

Art (4 matching dictionaries)
  1. ontology: ArtLex Lexicon of Visual Art Terminology
  2. ontology: Dictionary of Philosophical Terms and Names
  3. Philosophy of Mind (No longer online)
  4. Literary Criticism (No longer online)

Business (3 matching dictionaries)
  1. Ontology: eyefortransport e-commerce transportation glossary
  2. Ontology: Inflation Glossary
  3. BusinessDictionary.com (No longer online)

Computing (4 matching dictionaries)
  1. ontology: Free On-line Dictionary of Computing
  2. ontology: Netlingo
  3. Ontology: Cybernetics and Systems
  4. Ontology (philosophy), ontology: Encyclopedia

Medicine (2 matching dictionaries)
  1. online medical dictionary (No longer online)
  2. Ontology (philosophy), ontology: Medical dictionary

Miscellaneous (3 matching dictionaries)
  1. A Brief Critical Dictionary of Education (No longer online)
  2. ontology: Glosario de términos filosóficos (en inglés)
  3. ontology: The Skeptic's Dictionary

Religion (3 matching dictionaries)
  1. Ontology: Catholic Encyclopedia
  2. Postmodern Bible Dictionary (No longer online)
  3. Irivng Hexham's Concise Dictionary of Religion (No longer online)

Science (6 matching dictionaries)
  1. Dictionary of anthropology (No longer online)
  2. Drug Discovery and Development (No longer online)
  3. Dictionary of anthropology (No longer online)
  4. ontology: PlanetMath Encyclopedia
  5. Anthropology dictionary (No longer online)
  6. FOLDOP - Free On Line Dictionary Of Philosophy (No longer online)

Tech (1 matching dictionary)
  1. ontology: Search Engine Dictionary

(Note: See ontologist as well.)

Definitions from Wiktionary (
)
American English Definition British English Definition
noun:  (uncountable, philosophy) The branch of metaphysics that addresses the nature or essential characteristics of being and of things that exist; the study of being qua being.
noun:  (uncountable, philosophy) In a subject view, or a world view, the set of conceptual or material things or classes of things that are recognised as existing, or are assumed to exist in context, and their interrelations; in a body of theory, the ontology comprises the domain of discourse, the things that are defined as existing, together with whatever emerges from their mutual implications.
noun:  (countable, philosophy) The theory of a particular philosopher or school of thought concerning the fundamental types of entity in the universe.
noun:  (logic) A logical system involving theory of classes, developed by Stanislaw Lesniewski (1886-1939).
noun:  (countable, computer science, information science) A structure of concepts or entities within a domain, organized by relationships; a system model.

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