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Constant in Irish (Buanuimhir): Meaning, Pronunciation, Usage

The Irish for constant is buanuimhir, a feminine noun (plural buanuimhreacha).
Updated October 2026Report a mistake

How to say “constant” in Irish

Irish:
buanuimhir
English:
constant
Word type:
noun
Gender:
feminine
Pronunciation:
“BWAN-iv-ir”  /ˈbˠuənˌɪvʲɪɾʲ/
Various forms
Plural:
buanuimhreacha (constants)
Genitive singular:
buanuimhreach, na buanuimhreach (e.g. luach na buanuimhreach, the value of the constant)
Genitive plural:
buanuimhreacha, na mbuanuimhreacha (e.g. liosta na mbuanuimhreacha, the list of the constants)

What does “buanuimhir” mean?

constant
A number or quantity that has a fixed value and does not change, used in mathematics and science.Also: constant number, fixed number, mathematical constant.

“Buanuimhir” with the article

The plural of constant in Irish is buanuimhreacha. Here is buanuimhir after the article (an t-alt), in the singular and the plural.

an bhuanuimhir
the constant
Lenition: b becomes bh after an (feminine noun)
na buanuimhreacha
the constants
Plural: no change after na

“Buanuimhir” in a sentence: Irish examples

Common Irish sentences using buanuimhir, the Irish word for constant.

Is buanuimhir í pí.
Pi is a constant.
Ní athraíonn luach na buanuimhreach riamh.
The value of the constant never changes.
Scríobh an bhuanuimhir ar an gclár bán.
Write the constant on the whiteboard.
Tá go leor buanuimhreacha tábhachtacha san fhisic.
There are many important constants in physics.
Cuir an bhuanuimhir isteach sa chothromóid.
Put the constant into the equation.
D'fhoghlaimíomar faoi bhuanuimhreacha sa rang matamaitice.
We learned about constants in maths class.
Is í c an bhuanuimhir do luas an tsolais.
c is the constant for the speed of light.

Other nouns in Irish

More everyday Irish nouns to learn next.

Constant in Irish: frequently asked questions

What is the Irish for constant?

The Irish for constant is buanuimhir (pronounced “BWAN-iv-ir”). It’s a feminine noun and the plural is buanuimhreacha.

How do you pronounce buanuimhir in Irish?

Buanuimhir is said like “BWAN-iv-ir” (IPA /ˈbˠuənˌɪvʲɪɾʲ/).

What is the plural of constant in Irish?

The plural of buanuimhir is buanuimhreacha; with the article, na buanuimhreacha means “the constants”. The genitive plural is buanuimhreacha, as in liosta na mbuanuimhreacha (the list of the constants).

Why does buanuimhir change to bhuanuimhir or mbuanuimhir?

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

What is the opposite of 'buanuimhir' in algebra?

A quantity that changes is an 'athróg' (variable), while 'buanuimhir' stays fixed.

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