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Cardinal number in Irish (Bunuimhir): Meaning, Pronunciation, Usage

‘bunuimhir’ also means: radix

The Irish for cardinal number is bunuimhir, a feminine noun (plural bunuimhreacha).
Updated October 2026Report a mistake

How to say “cardinal number” in Irish

Irish:
bunuimhir
English:
cardinal number, radix
Word type:
noun
Gender:
feminine
Pronunciation:
“BUN-iv-ir”  /ˈbʊnˌɪvʲɪɾʲ/
Various forms
Plural:
bunuimhreacha (cardinal numbers)
Genitive singular:
bunuimhreach, na bunuimhreach (e.g. foirm na bunuimhreach, the form of the cardinal number)
Genitive plural:
bunuimhreacha, na mbunuimhreacha (e.g. ord na mbunuimhreacha, the order of the cardinal numbers)

What does “bunuimhir” mean?

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

cardinal number
A number used for counting, such as one, two or three, as opposed to an ordinal like first or second.Also: cardinal, counting number.
1 other meaning: radix
2radix
In mathematics, the base of a number system, such as ten in the decimal system.Also: base, number base.

“Bunuimhir” with the article

The plural of cardinal number in Irish is bunuimhreacha. Here is bunuimhir after the article (an t-alt), in the singular and the plural.

an bhunuimhir
the cardinal number
Lenition: b becomes bh after an (feminine noun)
na bunuimhreacha
the cardinal numbers
Plural: no change after na

“Bunuimhir” in a sentence: Irish examples

Common Irish sentences using bunuimhir, the Irish word for cardinal number.

Is bunuimhir í "trí".
"Three" is a cardinal number.
Cuireann an bhunuimhir séimhiú ar an ainmfhocal.
The cardinal number lenites the noun.
Foghlaimímid na bunuimhreacha ar dtús.
We learn the cardinal numbers first.
Scríobh an bhunuimhir i bhfocail.
Write the cardinal number in words.
Tá rialacha na bunuimhreach casta go leor.
The rules of the cardinal number are fairly complicated.
Cén difríocht atá idir bunuimhir agus orduimhir?
What is the difference between a cardinal and an ordinal number?
Bhí botún sa bhunuimhir a scríobh mé.
There was a mistake in the cardinal number I wrote.

Other nouns in Irish

More everyday Irish nouns to learn next.

Cardinal number in Irish: frequently asked questions

What is the Irish for cardinal number?

The Irish for cardinal number is bunuimhir (pronounced “BUN-iv-ir”). It’s a feminine noun and the plural is bunuimhreacha. Depending on context it can also mean radix.

How do you pronounce bunuimhir in Irish?

Bunuimhir is said like “BUN-iv-ir” (IPA /ˈbʊnˌɪvʲɪɾʲ/).

What is the plural of cardinal number in Irish?

The plural of bunuimhir is bunuimhreacha; with the article, na bunuimhreacha means “the cardinal numbers”. The genitive plural is bunuimhreacha, as in ord na mbunuimhreacha (the order of the cardinal numbers).

Does bunuimhir have more than one meaning?

Yes. Bunuimhir can mean cardinal number or radix, depending on context; the first is the most common.

Why does bunuimhir change to bhunuimhir or mbunuimhir?

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

What is the difference between bunuimhir and orduimhir?

A bunuimhir is a counting number like a haon, a dó, while an orduimhir is an ordinal like an chéad, an dara.

Is bunuimhir the same as maoluimhir?

Not quite: maoluimhreacha are the bare counting numbers used without a noun (a haon, a dó), while bunuimhreacha is the general grammatical term for cardinal numbers, including those used with nouns (aon bhord amháin).

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