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Infinity in Irish (Infinideacht): Meaning, Pronunciation, Usage

The Irish for infinity is infinideacht, a feminine noun.
Updated October 2026Report a mistake

How to say “infinity” in Irish

Irish:
infinideacht
English:
infinity
Word type:
noun
Gender:
feminine
Pronunciation:
“IN-fin-ij-ukht”  /ˈɪnʲfʲɪnʲɪdʲəxt̪/
Various forms
Genitive singular:
infinideachta, na hinfinideachta (e.g. siombail na hinfinideachta, the symbol for infinity)

What does “infinideacht” mean?

infinity
The state of being without limit or end, especially in mathematics, where it is a quantity greater than any number.Also: infinitude, endlessness, boundlessness.

“Infinideacht” with the article

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

an infinideacht
the infinity
No change: feminine nouns starting with a vowel keep their form after an

“Infinideacht” in a sentence: Irish examples

Common Irish sentences using infinideacht, the Irish word for infinity.

Ní féidir infinideacht a chomhaireamh.
Infinity cannot be counted.
Tá an infinideacht deacair le tuiscint.
Infinity is hard to understand.
Scríobh an múinteoir siombail na hinfinideachta ar an gclár.
The teacher wrote the infinity symbol on the board.
Téann an tsraith seo chun infinideachta.
This series tends to infinity.
Labhair an t-ollamh faoin infinideacht sa léacht.
The professor spoke about infinity in the lecture.
Is coincheap fealsúnach í an infinideacht freisin.
Infinity is also a philosophical concept.
Bhí sé ag smaoineamh ar infinideacht na cruinne.
He was thinking about the infinity of the universe.

Other nouns in Irish

More everyday Irish nouns to learn next.

Infinity in Irish: frequently asked questions

What is the Irish for infinity?

The Irish for infinity is infinideacht (pronounced “IN-fin-ij-ukht”). It’s a feminine noun.

How do you pronounce infinideacht in Irish?

Infinideacht is said like “IN-fin-ij-ukht” (IPA /ˈɪnʲfʲɪnʲɪdʲəxt̪/).

Does infinideacht have a plural?

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

Why does infinideacht sometimes have a t or h in front of it?

Irish nouns beginning with a vowel take a prefix after certain words: an infinideacht (the infinity), a hinfinideacht (her infinity), a n-infinideacht (their infinity).

What is the difference between infinideacht and síoraíocht?

Infinideacht is limitlessness in general, especially mathematical infinity, while síoraíocht means eternity, endless time.

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