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
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/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
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