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Ontology in Irish (Ointeolaíocht): Meaning, Pronunciation, Usage

The Irish for ontology is ointeolaíocht, a feminine noun (plural ointeolaíochtaí).
Updated October 2026Report a mistake

How to say “ontology” in Irish

Irish:
ointeolaíocht
English:
ontology
Word type:
noun
Gender:
feminine, third declension
Pronunciation:
“in-tyoh-LEE-ukht”  /ɪnʲtʲoːˈl̪ˠiːəxt̪ˠ/
Various forms
Plural:
ointeolaíochtaí (ontologies)
Genitive singular:
ointeolaíochta, na hointeolaíochta (e.g. ceisteanna na hointeolaíochta, questions of ontology)
Genitive plural:
ointeolaíochtaí, na n-ointeolaíochtaí (e.g. comparáid na n-ointeolaíochtaí, the comparison of the ontologies)

What does “ointeolaíocht” mean?

“Ointeolaíocht” has two alternative meanings. The most common comes first.

ontology
The branch of philosophy that studies the nature of being and existence.Also: study of being, metaphysics of existence.
1 other meaning:
2ontology
In computing and information science, a formal structured set of concepts and the relations between them.Also: knowledge model, concept schema.

“Ointeolaíocht” with the article

The plural of ontology in Irish is ointeolaíochtaí. Here is ointeolaíocht after the article (an t-alt), in the singular and the plural.

an ointeolaíocht
the ontology
No change: feminine nouns starting with a vowel keep their form after an
na hointeolaíochtaí
the ontologies
Plural: na adds h before a vowel

“Ointeolaíocht” in a sentence: Irish examples

Common Irish sentences using ointeolaíocht, the Irish word for ontology.

Is brainse den fhealsúnacht í an ointeolaíocht.
Ontology is a branch of philosophy.
Tá suim mhór aici san ointeolaíocht.
She is very interested in ontology.
Phléigh an léachtóir ceisteanna na hointeolaíochta inniu.
The lecturer discussed questions of ontology today.
Baineann ointeolaíocht leis an mbith agus leis an saol.
Ontology deals with being and existence.
Chruthaigh siad ointeolaíochtaí nua don bhunachar sonraí.
They created new ontologies for the database.
Scríobh sé tráchtas ar ointeolaíocht Heidegger.
He wrote a thesis on Heidegger's ontology.
Ní thuigim an ointeolaíocht go maith fós.
I don't understand ontology well yet.

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Ontology in Irish: frequently asked questions

What is the Irish for ontology?

The Irish for ontology is ointeolaíocht (pronounced “in-tyoh-LEE-ukht”). It’s a feminine noun and the plural is ointeolaíochtaí.

How do you pronounce ointeolaíocht in Irish?

Ointeolaíocht is said like “in-tyoh-LEE-ukht” (IPA /ɪnʲtʲoːˈl̪ˠiːəxt̪ˠ/).

What is the plural of ontology in Irish?

The plural of ointeolaíocht is ointeolaíochtaí; with the article, na hointeolaíochtaí means “the ontologies”. The genitive plural is ointeolaíochtaí, as in comparáid na n-ointeolaíochtaí (the comparison of the ontologies).

Why does ointeolaíocht sometimes have a t or h in front of it?

Irish nouns beginning with a vowel take a prefix after certain words: an ointeolaíocht (the ontology), a hointeolaíocht (her ontology), a n-ointeolaíocht (their ontology), na hointeolaíochtaí (the ontologies).

How is ointeolaíocht different from eipistéimeolaíocht?

Ointeolaíocht is the study of what exists, while eipistéimeolaíocht is the study of knowledge and how we know things.

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