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Definition in Irish (Sainmhíniú): Meaning, Pronunciation, Usage

The Irish for definition is sainmhíniú, a masculine noun. Ag sainmhíniú is defining, from the verb sainmhínigh.
Updated October 2026Report a mistake

How to say “definition” in Irish

Irish:
sainmhíniú
English:
definition
Word type:
noun (verbal noun)
Verbal noun of:
sainmhínigh, to define (ag sainmhíniú, defining)
Gender:
masculine
Pronunciation:
“SAN-veen-oo”  /ˈsanʲvʲiːnʲuː/
Various forms
Genitive singular:
sainmhínithe, an tsainmhínithe (e.g. téarmaí an tsainmhínithe, the terms of the definition)

What does “sainmhíniú” mean?

definition
A precise statement of what a word, term or thing means; also the verbal noun of sainmhínigh, the act of defining.Also: defining, specification.

“Sainmhíniú” as a verbal noun

After ag, sainmhíniú means defining: it is the verbal noun of the verb sainmhínigh (to define). A noun that follows it goes into the genitive.

agat
+
sainmhíniúverbal noun
=
ag sainmhíniúdefining

“Sainmhíniú” with the article

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

an sainmhíniú
the definition
No change after an

“Sainmhíniú” in a sentence: Irish examples

Common Irish sentences using sainmhíniú, the Irish word for definition.

Tá sainmhíniú an fhocail sin san fhoclóir.
The definition of that word is in the dictionary.
Ní thuigim an sainmhíniú seo ar chor ar bith.
I don't understand this definition at all.
Thug an múinteoir sainmhíniú soiléir dúinn.
The teacher gave us a clear definition.
Cuir sainmhíniú ar an téarma i do fhreagra.
Put a definition of the term in your answer.
Bhí focal deacair i lár an tsainmhínithe.
There was a difficult word in the middle of the definition.
De réir an tsainmhínithe dhlíthiúil, is fostaí é.
According to the legal definition, he is an employee.
Tá gá le sainmhíniú níos cruinne anseo.
A more precise definition is needed here.

Other nouns in Irish

More everyday Irish nouns to learn next.

Definition in Irish: frequently asked questions

What is the Irish for definition?

The Irish for definition is sainmhíniú (pronounced “SAN-veen-oo”). It’s a masculine noun.

How do you pronounce sainmhíniú in Irish?

Sainmhíniú is said like “SAN-veen-oo” (IPA /ˈsanʲvʲiːnʲuː/).

Does sainmhíniú have a plural?

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

Why does sainmhíniú change to shainmhíniú?

After words like mo (my) and do (your) the first letter is lenited: mo shainmhíniú. After ár (our) it stays ár sainmhíniú, because s does not take eclipsis.

What is the difference between sainmhíniú and míniú?

Míniú is a general explanation, while sainmhíniú is a precise, formal definition, such as one in a dictionary or a law.

How do I say 'define X' in Irish?

Use the verb sainmhínigh, for example 'Sainmhínigh an téarma seo', or say 'Tabhair sainmhíniú ar...'.

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