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Reasoning in Irish (Réasúnú): Meaning, Pronunciation, Usage

‘réasúnú’ also means: rationalization

The Irish for reasoning is réasúnú, a masculine noun. Ag réasúnú is reasoning, from the verb réasúnaigh.
Updated October 2026Report a mistake

How to say “reasoning” in Irish

Irish:
réasúnú
English:
reasoning, rationalization
Word type:
noun (verbal noun)
Verbal noun of:
réasúnaigh, to reason (ag réasúnú, reasoning)
Gender:
masculine
Pronunciation:
“RAY-suh-noo”  /ˈɾʲeːsˠuːnˠuː/
Various forms
Genitive singular:
réasúnaithe, an réasúnaithe (e.g. cumas réasúnaithe, ability to reason)

What does “réasúnú” mean?

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

reasoning
The act of thinking logically to reach a conclusion; the verbal noun of the verb réasúnaigh.Also: reason, logical thinking, argument.
1 other meaning: rationalization
2rationalization
The act of making something rational or more efficient, or of justifying something with reasons; also the verbal noun of réasúnaigh.Also: rationalisation, streamlining.

Other Irish words for reasoning: réasún (reason)

“Réasúnú” as a verbal noun

After ag, réasúnú means reasoning: it is the verbal noun of the verb réasúnaigh (to reason). A noun that follows it goes into the genitive.

agat
+
réasúnúverbal noun
=
ag réasúnúreasoning

“Réasúnú” with the article

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

an réasúnú
the reasoning
No change after an

“Réasúnú” in a sentence: Irish examples

Common Irish sentences using réasúnú, the Irish word for reasoning.

Bhí a réasúnú soiléir agus loighciúil.
His reasoning was clear and logical.
Ní aontaím leis an réasúnú sin ar chor ar bith.
I don't agree with that reasoning at all.
Tá cumas réasúnaithe maith ag an bpáiste sin.
That child has a good ability to reason.
Bhí locht ar mo réasúnú, admhaím é.
There was a flaw in my reasoning, I admit it.
Is gá réasúnú cúramach i gcás mar seo.
Careful reasoning is needed in a case like this.
Míníodh próiseas an réasúnaithe sa leabhar.
The reasoning process was explained in the book.
Tá siad ag réasúnú leis an bhfostaí ó mhaidin.
They have been reasoning with the employee since morning.

Other nouns in Irish

More everyday Irish nouns to learn next.

Reasoning in Irish: frequently asked questions

What is the Irish for reasoning?

The Irish for reasoning is réasúnú (pronounced “RAY-suh-noo”). It’s a masculine noun. Depending on context it can also mean rationalization.

How do you pronounce réasúnú in Irish?

Réasúnú is said like “RAY-suh-noo” (IPA /ˈɾʲeːsˠuːnˠuː/).

Does réasúnú have a plural?

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

Does réasúnú have more than one meaning?

Yes. Réasúnú can mean reasoning or rationalization, depending on context; the first is the most common.

How is réasúnú different from réasún?

Réasún means reason or sense as a faculty or cause, while réasúnú is the act or process of reasoning, the verbal noun of réasúnaigh.

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