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Function in Irish (Feidhm): Meaning, Pronunciation, Usage

‘feidhm’ also means: effect · need · function (mathematics)

The Irish for function is feidhm, a feminine noun (plural feidhmeanna).
Updated October 2026Report a mistake

How to say “function” in Irish

Irish:
feidhm
English:
function, effect, need, function (mathematics)
Word type:
noun
Gender:
feminine, second declension
Pronunciation:
“faim”  /fʲəimʲ/
Various forms
Plural:
feidhmeanna (functions)
Genitive singular:
feidhme, na feidhme (e.g. réimse feidhme, scope of application)
Genitive plural:
feidhmeanna, na bhfeidhmeanna (e.g. liosta na bhfeidhmeanna, the list of functions)

What does “feidhm” mean?

“Feidhm” has four alternative meanings. The most common comes first.

function
The purpose or job that something or someone performs.Also: purpose, role, use.
3 other meanings: effect or need or function (mathematics)
2effect
Force or operation, especially in the phrase 'cur i bhfeidhm', putting something into effect.Also: operation, implementation, application, force.
3need
A need or necessity to do something, as in 'níl feidhm leis', there is no need for it.Also: necessity, call.
4function (mathematics)
In mathematics, a relation that gives one output value for each input.Also: function, mathematical function.

Other Irish words for function: feidhmigh (function)

“Feidhm” with the article

The plural of function in Irish is feidhmeanna. Here is feidhm after the article (an t-alt), in the singular and the plural.

an fheidhm
the function
Lenition: f becomes fh after an (feminine noun)
na feidhmeanna
the functions
Plural: no change after na

“Feidhm” in a sentence: Irish examples

Common Irish sentences using feidhm, the Irish word for function.

Cén fheidhm atá leis an gcnaipe seo?
What is this button for?
Cuirfear an plean i bhfeidhm an bhliain seo chugainn.
The plan will be implemented next year.
Níl feidhm ar bith leis an seanmheaisín sin.
That old machine is no use at all.
Tá an dlí nua i bhfeidhm anois.
The new law is in force now.
Tá feidhmeanna éagsúla ag an bhfón seo.
This phone has various functions.
Ní oibríonn an fheidhm sin ar mo ríomhaire.
That function doesn't work on my computer.
Is í feidhm an chroí fuil a phumpáil.
The function of the heart is to pump blood.

Other nouns in Irish

More everyday Irish nouns to learn next.

Function in Irish: frequently asked questions

What is the Irish for function?

The Irish for function is feidhm (pronounced “faim”). It’s a feminine noun and the plural is feidhmeanna. Depending on context it can also mean effect or need or function (mathematics).

How do you pronounce feidhm in Irish?

Feidhm is said like “faim” (IPA /fʲəimʲ/).

What is the plural of function in Irish?

The plural of feidhm is feidhmeanna; with the article, na feidhmeanna means “the functions”. The genitive plural is feidhmeanna, as in liosta na bhfeidhmeanna (the list of functions).

Does feidhm have more than one meaning?

Yes. Feidhm can mean function, effect, need or function (mathematics), depending on context; the first is the most common.

Why does feidhm change to fheidhm or bhfeidhm?

Irish changes the start of some words after certain words. After mo (my) feidhm becomes m'fheidhm (lenition), and after ár (our) or i (in) it becomes ár bhfeidhm (eclipsis).

How do I say 'to implement' or 'to put into effect' in Irish?

Use 'cuir i bhfeidhm', for example 'an dlí a chur i bhfeidhm', to enforce the law.

What does 'níl feidhm leis' mean?

It means 'there is no need for it' or 'it is no use'; 'níl feidhm orm' means 'I don't have to'.

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