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Separation in Irish (Dealú): Meaning, Pronunciation, Usage

‘dealú’ also means: subtraction · distinction

The Irish for separation is dealú, a masculine noun (plural dealuithe). Ag dealú is separating, from the verb dealaigh.
Updated October 2026Report a mistake

How to say “separation” in Irish

Irish:
dealú
English:
separation, subtraction, distinction
Word type:
noun (verbal noun)
Verbal noun of:
dealaigh, to separate (ag dealú, separating)
Gender:
masculine, fourth declension
Pronunciation:
“DYAL-oo”  /ˈdʲal̪ˠuː/
Various forms
Plural:
dealuithe (separations)
Genitive singular:
dealaithe, an dealaithe (e.g. pointe an dealaithe, the point of separation)
Genitive plural:
dealuithe, na ndealuithe (e.g. céim na ndealuithe, the stage of the separations)

What does “dealú” mean?

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

separation
The act of separating or parting things or people; verbal noun of the verb 'dealaigh'.Also: parting, dividing, separating.
2 other meanings: subtraction or distinction
2subtraction
In arithmetic, the operation of taking one number away from another.Also: subtracting, taking away, minus.
3distinction
The act of telling things apart or making a distinction between them.Also: differentiation, distinguishing.

Other Irish words for separation: scaradh (separation)

“Dealú” as a verbal noun

After ag, dealú means separating: it is the verbal noun of the verb dealaigh (to separate). A noun that follows it goes into the genitive.

agat
+
dealúverbal noun
=
ag dealúseparating

“Dealú” with the article

The plural of separation in Irish is dealuithe. Here is dealú after the article (an t-alt), in the singular and the plural.

an dealú
the separation
No change after an
na dealuithe
the separations
Plural: no change after na

“Dealú” in a sentence: Irish examples

Common Irish sentences using dealú, the Irish word for separation.

Tá an dealú deacair don pháiste fós.
Subtraction is still hard for the child.
Rinneamar suimiú agus dealú ar scoil inniu.
We did addition and subtraction at school today.
Scríobh comhartha dealaithe idir an dá uimhir.
Write a minus sign between the two numbers.
Bhí an dealú ó mo mhuintir an-chrua orm.
Being separated from my family was very hard on me.
Tá deich gceist dealaithe le déanamh agam.
I have ten subtraction questions to do.
Ní raibh aon dealú idir an dá rud.
There was no distinction between the two things.
Chríochnaigh sí na ceisteanna dealaithe go tapa.
She finished the subtraction questions quickly.

Other nouns in Irish

More everyday Irish nouns to learn next.

Separation in Irish: frequently asked questions

What is the Irish for separation?

The Irish for separation is dealú (pronounced “DYAL-oo”). It’s a masculine noun and the plural is dealuithe. Depending on context it can also mean subtraction or distinction.

How do you pronounce dealú in Irish?

Dealú is said like “DYAL-oo” (IPA /ˈdʲal̪ˠuː/).

What is the plural of separation in Irish?

The plural of dealú is dealuithe; with the article, na dealuithe means “the separations”. The genitive plural is dealuithe, as in céim na ndealuithe (the stage of the separations).

Does dealú have more than one meaning?

Yes. Dealú can mean separation, subtraction or distinction, depending on context; the first is the most common.

Why does dealú change to dhealú or ndealú?

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

What is the difference between 'dealú' and 'scaradh'?

Both can mean separation, but 'dealú' is the usual word for subtraction in maths, while 'scaradh' is more common for people parting, as in 'scaradh pósta'.

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