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Adult in Irish (Aosach): Meaning, Pronunciation, Usage

The Irish for adult is aosach, a masculine noun (plural aosaigh).
Updated October 2026Report a mistake

How to say “adult” in Irish

Irish:
aosach
English:
adult
Word type:
noun
Gender:
masculine, first declension
Pronunciation:
“EE-suhkh”  /iːsˠəx/
Various forms
Plural:
aosaigh (adults)
Genitive singular:
aosaigh, an aosaigh (e.g. cearta an aosaigh, the rights of the adult)
Genitive plural:
aosach, na n-aosach (e.g. oideachas aosach, adult education)

What does “aosach” mean?

adult
A fully grown person, as opposed to a child.Also: grown-up, grown person.

“Aosach” with the article

The plural of adult in Irish is aosaigh. Here is aosach after the article (an t-alt), in the singular and the plural.

an t-aosach
the adult
Masculine nouns take t before a vowel after an
na haosaigh
the adults
Plural: na adds h before a vowel

“Aosach” in a sentence: Irish examples

Common Irish sentences using aosach, the Irish word for adult.

Is aosach é anois.
He is an adult now.
Tá an t-aosach freagrach as an bpáiste.
The adult is responsible for the child.
Bhí na haosaigh ag caint sa chistin.
The adults were talking in the kitchen.
Tá ranganna Gaeilge ar fáil d'aosaigh.
Irish classes are available for adults.
Ní mór aosach a bheith i láthair i gcónaí.
An adult must always be present.
Is ticéad aosaigh é seo.
This is an adult ticket.
Bhí scór aosach agus deichniúr páistí ann.
There were twenty adults and ten children there.

Other nouns in Irish

More everyday Irish nouns to learn next.

Adult in Irish: frequently asked questions

What is the Irish for adult?

The Irish for adult is aosach (pronounced “EE-suhkh”). It’s a masculine noun and the plural is aosaigh.

How do you pronounce aosach in Irish?

Aosach is said like “EE-suhkh” (IPA /iːsˠəx/).

What is the plural of adult in Irish?

The plural of aosach is aosaigh; with the article, na haosaigh means “the adults”. The genitive plural is aosach, as in oideachas aosach (adult education).

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

Irish nouns beginning with a vowel take a prefix after certain words: an t-aosach (the adult), a haosach (her adult), a n-aosach (their adult), na haosaigh (the adults).

Is there an adjective for adult in Irish?

Yes, 'fásta' is common, as in 'duine fásta' (a grown-up), and many speakers prefer it to 'aosach' in everyday speech.

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