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

‘fios’ also means: information · occult knowledge

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

How to say “knowledge” in Irish

Irish:
fios
English:
knowledge, information, occult knowledge
Word type:
noun
Gender:
masculine, third declension
Pronunciation:
“fiss”  /fʲɪsˠ/
Various forms
Genitive singular:
feasa, an fheasa (e.g. bean feasa, fortune-teller (wise woman))

What does “fios” mean?

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

knowledge
The state of knowing something; used in the common phrase 'tá a fhios agam' (I know).Also: knowing, awareness.
2 other meanings: information or occult knowledge
2information
Facts or news that someone is told or finds out about something.Also: news, word.
3occult knowledge
Supernatural knowledge or second sight, as possessed by a fortune-teller or seer.Also: second sight, clairvoyance.

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

“Fios” with the article

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

an fios
the knowledge
No change after an

“Fios” in a sentence: Irish examples

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

Níl a fhios agam cá bhfuil sé.
I don't know where he is.
Tá a fhios againn é sin cheana.
We know that already.
Tá fios an bhealaigh agam.
I know the way.
Chuir sí fios ar an dochtúir.
She sent for the doctor.
D'imigh sé gan fhios dá mháthair.
He left without his mother knowing.
Cuir fios chugam nuair a bheidh tú réidh.
Let me know when you are ready.
Bhí an bhean feasa ina cónaí sa ghleann.
The wise woman lived in the valley.

Other nouns in Irish

More everyday Irish nouns to learn next.

Phrases with “fios”

Knowledge in Irish: frequently asked questions

What is the Irish for knowledge?

The Irish for knowledge is fios (pronounced “fiss”). It’s a masculine noun. Depending on context it can also mean information or occult knowledge.

How do you pronounce fios in Irish?

Fios is said like “fiss” (IPA /fʲɪsˠ/).

Does fios have a plural?

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

Does fios have more than one meaning?

Yes. Fios can mean knowledge, information or occult knowledge, depending on context; the first is the most common.

Why does fios change to fhios or bhfios?

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

What is the difference between 'fios' and 'eolas'?

'Fios' is used mainly for knowing a fact, as in 'tá a fhios agam' (I know), while 'eolas' is knowledge or information about a subject or place, as in 'tá eolas agam ar an áit'.

What does 'cuir fios ar' mean?

'Cuir fios ar' means to send for someone, for example 'chuir siad fios ar an sagart' (they sent for the priest).

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