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Factor in Irish (Fachtóir): Meaning, Pronunciation, Usage

The Irish for factor is fachtóir, a masculine noun (plural fachtóirí).
Updated October 2026Report a mistake

How to say “factor” in Irish

Irish:
fachtóir
English:
factor
Word type:
noun
Gender:
masculine, third declension
Pronunciation:
“FAKH-toh-ir”  /ˈfaxtoːɾʲ/
Various forms
Plural:
fachtóirí (factors)
Genitive singular:
fachtóra, an fhachtóra (e.g. tábhacht an fhachtóra sin, the importance of that factor)
Genitive plural:
fachtóirí, na bhfachtóirí (e.g. tábhacht na bhfachtóirí, the importance of the factors)

What does “fachtóir” mean?

“Fachtóir” has three alternative meanings. The most common comes first.

factor
Something that helps to cause or influence a result or situation.Also: element, influence, cause.
2 other meanings:
2factor
In mathematics, a number that divides exactly into another number.Also: divisor.
3factor
A person who acts as an agent, especially one who manages property or does business for another.Also: agent, steward.

“Fachtóir” with the article

The plural of factor in Irish is fachtóirí. Here is fachtóir after the article (an t-alt), in the singular and the plural.

an fachtóir
the factor
No change after an
na fachtóirí
the factors
Plural: no change after na

“Fachtóir” in a sentence: Irish examples

Common Irish sentences using fachtóir, the Irish word for factor.

Is fachtóir tábhachtach í an aimsir.
The weather is an important factor.
Bhí go leor fachtóirí i gceist leis an gcinneadh.
Many factors were involved in the decision.
Cad é an fachtóir is mó anseo?
What is the biggest factor here?
Tá an costas ina fhachtóir dúinn.
The cost is a factor for us.
Is fachtóirí de dhó dhéag iad trí agus ceathair.
Three and four are factors of twelve.
Ní mór dúinn tionchar an fhachtóra seo a mheas.
We must assess the influence of this factor.
Phléigh siad na fachtóirí sóisialta sa tuarascáil.
They discussed the social factors in the report.

Other nouns in Irish

More everyday Irish nouns to learn next.

Factor in Irish: frequently asked questions

What is the Irish for factor?

The Irish for factor is fachtóir (pronounced “FAKH-toh-ir”). It’s a masculine noun and the plural is fachtóirí.

How do you pronounce fachtóir in Irish?

Fachtóir is said like “FAKH-toh-ir” (IPA /ˈfaxtoːɾʲ/).

What is the plural of factor in Irish?

The plural of fachtóir is fachtóirí; with the article, na fachtóirí means “the factors”. The genitive plural is fachtóirí, as in tábhacht na bhfachtóirí (the importance of the factors).

Why does fachtóir change to fhachtóir or bhfachtóir?

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

Is there another Irish word for 'factor' in the sense of a circumstance?

Yes, 'toisc' (plural 'tosca') is often used for circumstances or factors, as in 'tosca eacnamaíocha', economic factors; 'fachtóir' is common in technical and mathematical use.

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