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Third in Irish (Trian): Meaning, Pronunciation, Usage

‘trian’ also means: part

The Irish for third is trian, a masculine noun (plural trianta).
Updated October 2026Report a mistake

How to say “third” in Irish

Irish:
trian
English:
third, part
Word type:
noun
Gender:
masculine, first declension
Pronunciation:
“tree-un”  /tʲɾʲiən̪ˠ/
Various forms
Plural:
trianta (thirds)
Genitive singular:
triain, an triain (e.g. luach an triain, the value of the third)
Genitive plural:
trianta, na dtrianta (e.g. suim na dtrianta, the sum of the thirds)

What does “trian” mean?

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

third
One of three equal parts into which something is divided.Also: one third, third part.
1 other meaning: part
2part
A portion or division of something, often one of three parts, as in the three ancient divisions of a territory.Also: portion, division.

Other Irish words for third: tríú (third)

“Trian” with the article

The plural of third in Irish is trianta. Here is trian after the article (an t-alt), in the singular and the plural.

an trian
the third
No change after an
na trianta
the thirds
Plural: no change after na

“Trian” in a sentence: Irish examples

Common Irish sentences using trian, the Irish word for third.

Fuair mé trian den airgead.
I got a third of the money.
Tá dhá thrian den obair déanta againn.
We have done two thirds of the work.
Ghearr sí an cáca ina thrí thrian.
She cut the cake into three thirds.
Tá trian den rang tinn inniu.
A third of the class is sick today.
Íocfaidh mise an trian deireanach.
I will pay the last third.
Chaith sé trian den lá ag codladh.
He spent a third of the day sleeping.

Other nouns in Irish

More everyday Irish nouns to learn next.

Third in Irish: frequently asked questions

What is the Irish for third?

The Irish for third is trian (pronounced “tree-un”). It’s a masculine noun and the plural is trianta. Depending on context it can also mean part.

How do you pronounce trian in Irish?

Trian is said like “tree-un” (IPA /tʲɾʲiən̪ˠ/).

What is the plural of third in Irish?

The plural of trian is trianta; with the article, na trianta means “the thirds”. The genitive plural is trianta, as in suim na dtrianta (the sum of the thirds).

Does trian have more than one meaning?

Yes. Trian can mean third or part, depending on context; the first is the most common.

Why does trian change to thrian or dtrian?

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

How do you say 'two thirds' in Irish?

Say 'dhá thrian', with lenition after 'dhá' and the singular noun.

How is 'a third of' something expressed?

Use 'trian de', for example 'trian den airgead', a third of the money.

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