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Controller in Irish (Rialaitheoir): Meaning, Pronunciation, Usage

‘rialaitheoir’ also means: ruler

The Irish for controller is rialaitheoir, a masculine noun (plural rialaitheoirí).
Updated October 2026Report a mistake

How to say “controller” in Irish

Irish:
rialaitheoir
English:
controller, ruler
Word type:
noun
Gender:
masculine, third declension
Pronunciation:
“REE-uh-lih-hore”  /ˈɾʲiəlˠəhoːɾʲ/
Various forms
Plural:
rialaitheoirí (controllers)
Genitive singular:
rialaitheora, an rialaitheora (e.g. oifig an rialaitheora, the controller's office)
Genitive plural:
rialaitheoirí, na rialaitheoirí (e.g. cruinniú na rialaitheoirí, the controllers' meeting)

What does “rialaitheoir” mean?

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

controller
A person or device that controls or regulates something, such as a system, a machine or an organisation.Also: regulator, control device.
1 other meaning: ruler
2ruler
A person who rules or governs.Also: governor.

“Rialaitheoir” with the article

The plural of controller in Irish is rialaitheoirí. Here is rialaitheoir after the article (an t-alt), in the singular and the plural.

an rialaitheoir
the controller
No change after an
na rialaitheoirí
the controllers
Plural: no change after na

“Rialaitheoir” in a sentence: Irish examples

Common Irish sentences using rialaitheoir, the Irish word for controller.

Is rialaitheoir aerthráchta í mo dheirfiúr.
My sister is an air traffic controller.
Labhair an rialaitheoir leis an bhfoireann ar maidin.
The controller spoke to the staff this morning.
Tá oifig an rialaitheora ar an dara hurlár.
The controller's office is on the second floor.
Bhí na rialaitheoirí míshásta leis an gcomhlacht.
The controllers were unhappy with the company.
Bhris mo rialaitheoir cluichí inné.
My game controller broke yesterday.
Tá fadhb leis an rialaitheoir teasa sa seomra.
There's a problem with the heating controller in the room.
D'oibrigh sé mar rialaitheoir i gcomhlacht mór.
He worked as a controller in a big company.

Other nouns in Irish

More everyday Irish nouns to learn next.

Controller in Irish: frequently asked questions

What is the Irish for controller?

The Irish for controller is rialaitheoir (pronounced “REE-uh-lih-hore”). It’s a masculine noun and the plural is rialaitheoirí. Depending on context it can also mean ruler.

How do you pronounce rialaitheoir in Irish?

Rialaitheoir is said like “REE-uh-lih-hore” (IPA /ˈɾʲiəlˠəhoːɾʲ/).

What is the plural of controller in Irish?

The plural of rialaitheoir is rialaitheoirí; with the article, na rialaitheoirí means “the controllers”. The genitive plural is rialaitheoirí, as in cruinniú na rialaitheoirí (the controllers' meeting).

Does rialaitheoir have more than one meaning?

Yes. Rialaitheoir can mean controller or ruler, depending on context; the first is the most common.

What is the difference between 'rialaitheoir' and 'rialtóir'?

'Rialaitheoir' is mainly a controller or regulator, while 'rialtóir' is usually a ruler or governor, and also a ruler for measuring, though 'rialóir' is the usual word for that.

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