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Millennium in Irish (Mílaois): Meaning, Pronunciation, Usage

The Irish for millennium is mílaois, a feminine noun (plural mílaoiseanna).
Updated October 2026Report a mistake

How to say “millennium” in Irish

Irish:
mílaois
English:
millennium
Word type:
noun
Gender:
feminine, second declension
Pronunciation:
“MEEL-ee-sh”  /ˈmʲiːlˠiːʃ/
Various forms
Plural:
mílaoiseanna (millennia)
Genitive singular:
mílaoise, na mílaoise (e.g. tús na mílaoise, the beginning of the millennium)
Genitive plural:
mílaoiseanna, na mílaoiseanna (e.g. stair na mílaoiseanna, the history of the millennia)

What does “mílaois” mean?

millennium
A period of one thousand years.Also: thousand years, millenary.

“Mílaois” with the article

The plural of millennium in Irish is mílaoiseanna. Here is mílaois after the article (an t-alt), in the singular and the plural.

an mhílaois
the millennium
Lenition: m becomes mh after an (feminine noun)
na mílaoiseanna
the millennia
Plural: no change after na

“Mílaois” in a sentence: Irish examples

Common Irish sentences using mílaois, the Irish word for millennium.

Thosaigh an mhílaois nua sa bhliain dhá mhíle.
The new millennium began in the year two thousand.
Bhí ceiliúradh mór ann ag tús na mílaoise.
There was a big celebration at the start of the millennium.
Seasann an caisleán sin le breis is mílaois.
That castle has stood for over a thousand years.
Tógadh an mhainistir sa chéad mhílaois.
The monastery was built in the first millennium.
D'athraigh an teanga go mór thar na mílaoiseanna.
The language changed greatly over the millennia.
Is cuimhin liom oíche na mílaoise go maith.
I remember millennium night well.
Cad iad na dúshláin don mhílaois seo?
What are the challenges for this millennium?

Other nouns in Irish

More everyday Irish nouns to learn next.

Millennium in Irish: frequently asked questions

What is the Irish for millennium?

The Irish for millennium is mílaois (pronounced “MEEL-ee-sh”). It’s a feminine noun and the plural is mílaoiseanna.

How do you pronounce mílaois in Irish?

Mílaois is said like “MEEL-ee-sh” (IPA /ˈmʲiːlˠiːʃ/).

What is the plural of millennium in Irish?

The plural of mílaois is mílaoiseanna; with the article, na mílaoiseanna means “the millennia”. The genitive plural is mílaoiseanna, as in stair na mílaoiseanna (the history of the millennia).

Why does mílaois change to mhílaois?

After words like mo (my) and do (your) the first letter is lenited: mo mhílaois. After ár (our) it stays ár mílaois, because m does not take eclipsis.

How is 'mílaois' formed?

It combines 'míle' (thousand) and 'aois' (age), just as 'céad' is used for century, often 'aois' or 'céad bliain'.

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