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Authentication in Irish (Fíordheimhniú): Meaning, Pronunciation, Usage

The Irish for authentication is fíordheimhniú, a masculine noun. Ag fíordheimhniú is authenticating, from the verb fíordheimhnigh.
Updated October 2026Report a mistake

How to say “authentication” in Irish

Irish:
fíordheimhniú
English:
authentication
Word type:
noun (verbal noun)
Verbal noun of:
fíordheimhnigh, to authenticate (ag fíordheimhniú, authenticating)
Gender:
masculine
Pronunciation:
“FEER-yev-noo”  /ˈfʲiːɾˌjevʲnʲuː/
Various forms
Genitive singular:
fíordheimhnithe, an fhíordheimhnithe (e.g. próiseas an fhíordheimhnithe, the authentication process)

What does “fíordheimhniú” mean?

authentication
The act of confirming that something or someone is genuine, especially a document, signature or computer user; verbal noun of the verb fíordheimhnigh.Also: verification, certification, authenticating.

“Fíordheimhniú” as a verbal noun

After ag, fíordheimhniú means authenticating: it is the verbal noun of the verb fíordheimhnigh (to authenticate). A noun that follows it goes into the genitive.

agat
+
fíordheimhniúverbal noun
=
ag fíordheimhniúauthenticating

“Fíordheimhniú” with the article

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

an fíordheimhniú
the authentication
No change after an

“Fíordheimhniú” in a sentence: Irish examples

Common Irish sentences using fíordheimhniú, the Irish word for authentication.

Tá fíordheimhniú ag teastáil roimh logáil isteach.
Authentication is needed before logging in.
Theip ar an bhfíordheimhniú arís.
The authentication failed again.
Is gá cód fíordheimhnithe a chur isteach.
You need to enter an authentication code.
Seol an doiciméad le haghaidh fíordheimhnithe.
Send the document for authentication.
Rinne an nótaire fíordheimhniú ar an síniú.
The notary authenticated the signature.
Úsáideann an banc fíordheimhniú dhá chéim anois.
The bank now uses two-step authentication.
Bhí fadhb sa bhfíordheimhniú ar maidin.
There was a problem with the authentication this morning.

Other nouns in Irish

More everyday Irish nouns to learn next.

Authentication in Irish: frequently asked questions

What is the Irish for authentication?

The Irish for authentication is fíordheimhniú (pronounced “FEER-yev-noo”). It’s a masculine noun.

How do you pronounce fíordheimhniú in Irish?

Fíordheimhniú is said like “FEER-yev-noo” (IPA /ˈfʲiːɾˌjevʲnʲuː/).

Does fíordheimhniú have a plural?

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

Why does fíordheimhniú change to fhíordheimhniú or bhfíordheimhniú?

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

How is fíordheimhniú different from deimhniú?

Deimhniú means confirmation or certification in general, while fíordheimhniú specifically means proving that something is genuine, as in authentication of a user or document.

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