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Knowledge in Irish (Eolas): Meaning, Pronunciation, Usage

‘eolas’ also means: information · acquaintance · guidance

The Irish for knowledge is eolas, a masculine noun.
Updated October 2026Report a mistake

How to say “knowledge” in Irish

Irish:
eolas
English:
knowledge, information, acquaintance, guidance
Word type:
noun
Gender:
masculine, first declension
Pronunciation:
“OH-lus”  /ˈoːl̪ˠəsˠ/
Various forms
Genitive singular:
eolais, an eolais (e.g. bileog eolais, information leaflet)

What does “eolas” mean?

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

knowledge
What a person knows or understands about something.Also: understanding, know-how.
3 other meanings: information or acquaintance or guidance
2information
Facts or details given or obtained about something.Also: info, details, facts.
3acquaintance
Familiarity with a person, place or thing, as in 'tá eolas agam air'.Also: familiarity.
4guidance
Direction or the way to a place, as in showing someone the way.Also: direction, way.

Other Irish words for knowledge: fios (knowledge), iúl (knowledge), eol (knowledge), aithnid (acquaintance)

“Eolas” with the article

Here is eolas after the article (an t-alt).

an t-eolas
the knowledge
Masculine nouns take t before a vowel after an

“Eolas” in a sentence: Irish examples

Common Irish sentences using eolas, the Irish word for knowledge.

Tá eolas agam ar an gceantar sin.
I know that area.
Tá an t-eolas ar fad sa bhileog.
All the information is in the leaflet.
Tá tuilleadh eolais iarrtha againn.
We have asked for more information.
Sin iomlán m'eolais ar an ábhar.
That is all I know about the subject.
Níl eolas na slí agam.
I don't know the way.
Cá bhfaighidh mé eolas faoin gcúrsa?
Where will I get information about the course?
Chuir sí eolas orm ar an turas.
She got to know me on the trip.

Other nouns in Irish

More everyday Irish nouns to learn next.

Knowledge in Irish: frequently asked questions

What is the Irish for knowledge?

The Irish for knowledge is eolas (pronounced “OH-lus”). It’s a masculine noun. Depending on context it can also mean information or acquaintance or guidance.

How do you pronounce eolas in Irish?

Eolas is said like “OH-lus” (IPA /ˈoːl̪ˠəsˠ/).

Does eolas have a plural?

No plural form is given for eolas in the standard. Many abstract and mass nouns in Irish have no plural.

Does eolas have more than one meaning?

Yes. Eolas can mean knowledge, information, acquaintance or guidance, depending on context; the first is the most common.

Why does eolas sometimes have a t or h in front of it?

Irish nouns beginning with a vowel take a prefix after certain words: an t-eolas (the knowledge), a heolas (her knowledge), a n-eolas (their knowledge).

What is the difference between eolas and fios?

Eolas is knowledge or information about something, often acquired (tá eolas agam ar an áit), while fios is knowing a fact (tá a fhios agam).

How do I say 'I know him' using eolas?

Say 'tá eolas agam air', though 'tá aithne agam air' is more usual for knowing a person.

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