Standard Lemma guide

ontology

noun · 7 senses · updated from the 2026-07-25 local source snapshot

Definitions and examples are grouped by meaning. Pronunciation, history, word forms, translations, descendants, synonyms, antonyms, derived terms, and related words appear whenever the source provides them.

Sound

Pronunciation

Each Play button uses your device's default local English voice, or a natural local fallback. The selected voice name appears after playback. This is synthesized speech, not a source recording.

  • /ɒnˈtɒləd͡ʒi/
  • Southern-England: Recorded audio is listed in the source snapshot.
  • rhymes with -ɒlədʒi
  • CMU ARPABET: AA0 N T AA1 L AH0 JH IY0 Digits mark lexical stress: 1 primary, 2 secondary, 0 unstressed.

1

noun

Meaning 1

The branch of metaphysics that addresses the nature or essential characteristics of being and of things that exist; the study of being qua being.

Definition source: English Wiktionary via Wiktextract

Usage: uncountable

Topics: human-sciences, philosophy, sciences

No example sentence was provided for this meaning.

Meaning relationships

Synonyms: none provided

Antonyms: none provided

2

noun

Meaning 2

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.

Definition source: English Wiktionary via Wiktextract

Usage: uncountable

Topics: human-sciences, philosophy, sciences

Examples

  • Meronym: taxonomy

Meaning relationships

Synonyms: none provided

Antonyms: none provided

3

noun

Meaning 3

The theory of a particular philosopher or school of thought concerning the fundamental types of entity in the universe.

Definition source: English Wiktionary via Wiktextract

Usage: countable

Topics: human-sciences, philosophy, sciences

No example sentence was provided for this meaning.

Meaning relationships

Synonyms: none provided

Antonyms: none provided

4

noun

Meaning 4

A logical system involving theory of classes, developed by Stanislaw Lesniewski (1886-1939).

Definition source: English Wiktionary via Wiktextract

Usage: countable, uncountable

Topics: human-sciences, logic, mathematics, philosophy, sciences

No example sentence was provided for this meaning.

Meaning relationships

Synonyms: none provided

Antonyms: none provided

5

noun

Meaning 5

A structure of concepts or entities within a domain, organized by relationships; a system model.

Definition source: English Wiktionary via Wiktextract

Usage: countable

Topics: computer, computing, engineering, human-sciences, information-science, mathematics, natural-sciences, physical-sciences, science, sciences

No example sentence was provided for this meaning.

Meaning relationships

Synonyms: none provided

Antonyms: none provided

6

noun

Meaning 6

the metaphysical study of the nature of being and existence

Definition source: Princeton WordNet 3.0

No example sentence was provided for this meaning.

Meaning relationships

Synonyms: none provided

Antonyms: none provided

Broader terms: metaphysics

7

noun

Meaning 7

(computer science) a rigorous and exhaustive organization of some knowledge domain that is usually hierarchical and contains all the relevant entities and their relations

Definition source: Princeton WordNet 3.0

No example sentence was provided for this meaning.

Meaning relationships

Synonyms: none provided

Antonyms: none provided

Broader terms: arrangement, organization, organisation, system

History

Etymology

Learned borrowing from New Latin ontologia (1606, Ogdoas Scholastica, by Jacob Lorhard (Lorhardus)), from Ancient Greek ὤν, ὄντος (ṓn, óntos, “being”), present participle of εἰμί (eimí, “being, existing, essence”) + λόγος (lógos, “account”). By surface analysis, onto- + -logy. First known English use 1663: Archelogia philosophica nova; or, New principles of Philosophy. Containing Philosophy in general, Metaphysicks or Ontology, Dynamilogy or a Discourse of Power, Religio Philosophi or Natural Theology, Physicks or Natural philosophy, by Gideon Harvey (1636–1702), London, Thomson, 1663. Popularized as a philosophical term by German philosopher Christian Wolff (1679–1754).

Across languages

Translations

75 source translations are retained for this English entry.

  • Arabic: أُنْطُولُوجِيَّا (ʔunṭūlūjiyyā) — study of being
  • Armenian: գոյաբանություն (goyabanutʻyun) — study of being
  • Azerbaijani: ontologiya — study of being
  • Bashkir: онтология (ontologiya) — study of being
  • Belarusian: антало́гія (antalóhija) — study of being
  • Bengali: তত্ত্ববিদ্যা (tottobidda) — study of being
  • Catalan: ontologia — study of being
  • Chinese Mandarin: 本體論 /本体论 (běntǐlùn) — study of being
  • Czech: ontologie — study of being
  • Danish: ontologi — study of being
  • Dutch: ontologie — study of being
  • Faroese: verufrøði — study of being
  • Finnish: ontologia — study of being
  • French: ontologie — study of being
  • Galician: ontoloxía — study of being
  • Georgian: ონტოლოგია (onṭologia) — study of being
  • German: Ontologie — study of being
  • Greek: οντολογία (ontología) — study of being
  • Haitian Creole: ontoloji — study of being
  • Hebrew: אונטולוגיה (ontológia) — study of being
  • Hungarian: ontológia — study of being
  • Icelandic: verufræði — study of being
  • Indonesian: ontologi — study of being
  • Irish: ointeolaíocht — study of being
  • Italian: ontologia — study of being
  • Japanese: 存在論 (sonzairon) — study of being
  • Japanese: オントロジー (ontorojī) — study of being
  • Japanese: 本体論 (hontairon) — study of being
  • Kazakh: онтология (ontologiä) — study of being
  • Korean: 존재론 (jonjaeron) — study of being
  • Kyrgyz: онтология (ontologiya) — study of being
  • Latin: ontologia — study of being
  • Latvian: ontoloģija — study of being
  • Macedonian: онтологија (ontologija) — study of being
  • Malay: ontologi — study of being
  • Mongolian: онтологи (ontologi) — study of being
  • Norwegian: ontologi — study of being
  • Occitan: ontologia — study of being
  • Persian: هستیشناسی — study of being
  • Polish: ontologia — study of being
  • Portuguese: ontologia — study of being
  • Romanian: ontologie — study of being
  • Russian: онтоло́гия (ontológija) — study of being
  • Serbo-Croatian: ontològija — study of being
  • Serbo-Croatian: онтоло̀гија — study of being
  • Spanish: ontología — study of being
  • Swahili: ontolojia — study of being
  • Swedish: ontologi — study of being
  • Tagalog: dalubmagingan — study of being
  • Tamil: உள்ளியம் (uḷḷiyam) — study of being
  • Thai: ภววิทยา (pá-wá-wít-tá-yaa) — study of being
  • Turkish: varlık felsefesi — study of being
  • Turkish: ontoloji — study of being
  • Ukrainian: онтоло́гія (ontolóhija) — study of being
  • Vietnamese: bản thể luận — study of being
  • Yiddish: אָנטאָלאָגיע (ontologye) — study of being
  • Catalan: ontologia — system model in computer science
  • Czech: ontologie — system model in computer science
  • Finnish: ontologia — system model in computer science
  • French: ontologie — system model in computer science
  • German: Ontologie — system model in computer science
  • Greek: οντολογία (ontología) — system model in computer science
  • Irish: ointeolaíocht — system model in computer science
  • Italian: ontologia — system model in computer science
  • Latvian: ontoloģija — system model in computer science
  • Macedonian: онтологија (ontologija) — system model in computer science
  • Malay: ontologi — system model in computer science
  • Norwegian: ontologi — system model in computer science
  • Polish: ontologia — system model in computer science
  • Portuguese: ontologia — system model in computer science
  • Romanian: ontologie — system model in computer science
  • Russian: онтоло́гия (ontológija) — system model in computer science
  • Serbo-Croatian: ontològija — system model in computer science
  • Serbo-Croatian: онтоло̀гија — system model in computer science
  • Spanish: ontología — system model in computer science
Real reading context

ontology in complete knowledge articles