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Fifth in Irish (Cúigiú): Meaning, Pronunciation, Usage

‘cúigiú’ also means: fifth (in order)

The Irish for fifth is cúigiú, a masculine noun (plural cúigithe).
Updated October 2026Report a mistake

How to say “fifth” in Irish

Irish:
cúigiú
English:
fifth, fifth (in order)
Word type:
noun
Gender:
masculine
Pronunciation:
“KOO-gyoo”  /ˈkuːɟuː/
Various forms
Plural:
cúigithe (fifths)
Genitive singular:
cúigiú, an chúigiú (e.g. tús an chúigiú, the beginning of the fifth)
Genitive plural:
cúigithe, na gcúigithe (e.g. iomlán na gcúigithe, the total of the fifths)

What does “cúigiú” mean?

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

fifth
One of five equal parts into which something is divided.Also: one fifth, fifth part.
1 other meaning: fifth (in order)
2fifth (in order)
The person or thing that comes fifth in a series, such as the fifth day of a month.Also: fifth, fifth place, fifth day.

“Cúigiú” with the article

The plural of fifth in Irish is cúigithe. Here is cúigiú after the article (an t-alt), in the singular and the plural.

an cúigiú
the fifth
No change after an
na cúigithe
the fifths
Plural: no change after na

“Cúigiú” in a sentence: Irish examples

Common Irish sentences using cúigiú, the Irish word for fifth.

Tá cúigiú den airgead fós agam.
I still have a fifth of the money.
Fuair sé an cúigiú cuid den talamh.
He got a fifth of the land.
Tá cúigiú den rang as láthair inniu.
A fifth of the class is absent today.
Roinn an cáca ina chúigithe, le do thoil.
Divide the cake into fifths, please.
Tháinig sí sa chúigiú háit sa rás.
She came fifth in the race.
Beidh an cruinniú ar an gcúigiú lá de Mhárta.
The meeting will be on the fifth of March.
Cuir dhá chúigiú le trí chúigiú.
Add two fifths to three fifths.

Other nouns in Irish

More everyday Irish nouns to learn next.

Fifth in Irish: frequently asked questions

What is the Irish for fifth?

The Irish for fifth is cúigiú (pronounced “KOO-gyoo”). It’s a masculine noun and the plural is cúigithe. Depending on context it can also mean fifth (in order).

How do you pronounce cúigiú in Irish?

Cúigiú is said like “KOO-gyoo” (IPA /ˈkuːɟuː/).

What is the plural of fifth in Irish?

The plural of cúigiú is cúigithe; with the article, na cúigithe means “the fifths”. The genitive plural is cúigithe, as in iomlán na gcúigithe (the total of the fifths).

Does cúigiú have more than one meaning?

Yes. Cúigiú can mean fifth or fifth (in order), depending on context; the first is the most common.

Why does cúigiú change to chúigiú or gcúigiú?

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

Is 'cúigiú' a noun or an adjective?

It is both: as a noun it means 'a fifth' (cúigiú den airgead), and as an ordinal it precedes the noun, as in an cúigiú lá, 'the fifth day'.

How do I say 'two fifths'?

Use dhá chúigiú, as in dhá chúigiú den rang, 'two fifths of the class'.

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