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Theory in Irish (Teoiric): Meaning, Pronunciation, Usage

The Irish for theory is teoiric, a feminine noun.
Updated October 2026Report a mistake

How to say “theory” in Irish

Irish:
teoiric
English:
theory
Word type:
noun
Gender:
feminine, second declension
Pronunciation:
“TYOH-rik”  /ˈtʲoːɾʲɪc/
Various forms
Genitive singular:
teoirice, na teoirice (e.g. bunús na teoirice, the basis of the theory)

What does “teoiric” mean?

theory
A set of ideas intended to explain something, or the general principles of a subject as opposed to practice.Also: hypothesis, theoretical knowledge.

“Teoiric” with the article

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

an teoiric
the theory
No change: d and t are not lenited after an

“Teoiric” in a sentence: Irish examples

Common Irish sentences using teoiric, the Irish word for theory.

Níl an teoiric ceart, dar leis na saineolaithe.
The theory is wrong, according to the experts.
Tá teoiric agam faoin scéal sin.
I have a theory about that story.
Is maith liom an teoiric ach is fearr liom an cleachtadh.
I like the theory but I prefer the practice.
Mhínigh an múinteoir bunphointí na teoirice dúinn.
The teacher explained the basic points of the theory to us.
De réir na teoirice, ba cheart go n-oibreodh sé.
In theory, it should work.
Is í mo theoiric go raibh sé ag bréagadh.
My theory is that he was lying.
Scríobh sí aiste ar theoiric na héabhlóide.
She wrote an essay on the theory of evolution.

Other nouns in Irish

More everyday Irish nouns to learn next.

Theory in Irish: frequently asked questions

What is the Irish for theory?

The Irish for theory is teoiric (pronounced “TYOH-rik”). It’s a feminine noun.

How do you pronounce teoiric in Irish?

Teoiric is said like “TYOH-rik” (IPA /ˈtʲoːɾʲɪc/).

Does teoiric have a plural?

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

Why does teoiric change to theoiric or dteoiric?

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

How do I say 'in theory' in Irish?

Say 'i dteoiric' or 'go teoiriciúil', for example 'I dteoiric, tá sé éasca'.

What is the difference between 'teoiric' and 'hipitéis'?

'Teoiric' is a developed explanation or body of principles, while 'hipitéis' is a hypothesis still to be tested.

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