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Theology in Irish (Diagacht): Meaning, Pronunciation, Usage

‘diagacht’ also means: divinity · piety

The Irish for theology is diagacht, a feminine noun.
Updated October 2026Report a mistake

How to say “theology” in Irish

Irish:
diagacht
English:
theology, divinity, piety
Word type:
noun
Gender:
feminine, third declension
Pronunciation:
“DEE-uh-gukht”  /ˈdʲiəɡəxt̪/
Various forms
Genitive singular:
diagachta, na diagachta (e.g. dámh na diagachta, the faculty of theology)

What does “diagacht” mean?

“Diagacht” has three alternative meanings. The most common comes first.

theology
The study of God and religious belief, especially as an academic subject.Also: divinity, religious studies.
2 other meanings: divinity or piety
2divinity
The state or quality of being divine, of being God or a god.Also: godhead, godhood, godliness.
3piety
Devotion to God and religious practice in a person's life.Also: godliness, devoutness.

“Diagacht” with the article

Here is diagacht after the article (an t-alt).

an diagacht
the theology
No change: d and t are not lenited after an

“Diagacht” in a sentence: Irish examples

Common Irish sentences using diagacht, the Irish word for theology.

Tá sí ag déanamh staidéir ar an diagacht.
She is studying theology.
Is ollamh diagachta é i Má Nuad.
He is a professor of theology in Maynooth.
Bhain sé céim amach sa diagacht anuraidh.
He got a degree in theology last year.
Ní thuigim mórán faoi chúrsaí diagachta.
I don't understand much about theological matters.
Creideann Críostaithe i ndiagacht Chríost.
Christians believe in the divinity of Christ.
Is ábhar deacair í an diagacht.
Theology is a difficult subject.
Léigh mé leabhar nua diagachta an tseachtain seo.
I read a new theology book this week.

Other nouns in Irish

More everyday Irish nouns to learn next.

Theology in Irish: frequently asked questions

What is the Irish for theology?

The Irish for theology is diagacht (pronounced “DEE-uh-gukht”). It’s a feminine noun. Depending on context it can also mean divinity or piety.

How do you pronounce diagacht in Irish?

Diagacht is said like “DEE-uh-gukht” (IPA /ˈdʲiəɡəxt̪/).

Does diagacht have a plural?

No plural form is given for diagacht in the standard. Many abstract and mass nouns in Irish have no plural.

Does diagacht have more than one meaning?

Yes. Diagacht can mean theology, divinity or piety, depending on context; the first is the most common.

Why does diagacht change to dhiagacht or ndiagacht?

Irish changes the start of some words after certain words. After mo (my) diagacht becomes mo dhiagacht (lenition), and after ár (our) or i (in) it becomes ár ndiagacht (eclipsis).

What is the word for a theologian?

A theologian is 'diagaire', and the adjective theological is 'diaga' or 'diagachta' in the genitive, as in 'coláiste diagachta'.

How is 'diagacht' different from 'diadhacht'?

'Diagacht' is mainly the academic study of theology, while 'diadhacht' refers to godliness or the divine nature itself.

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