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a haon

one (1)

numeralA1

"a haon" means "one (1)" in Irish (numeral). Mutation forms: Urú → n-a haon, Réamhlitir h → ha haon, Réamhlitir t → t-a haon.

Mutation forms

In Irish, the first letter of "a haon" changes depending on the grammatical context. These are the mutated forms:

MutationForm
Base forma haon
Urún-a haon
Réamhlitir hha haon
Réamhlitir tt-a haon

"a haon" in context

Tá sé a haon a chlog.

It's one o'clock.

A2

Tá sé a haon déag a chlog.

It's eleven o'clock.

A2

Tá sé leathuair tar éis a haon.

It's half past one.

A2

Tá sé leath i ndiaidh a haon.

It's half past one.

A1

A haon, a dó, a trí, a ceathair, a cúig, a sé, a seacht, a hocht, a naoi, a deich.

One, two, three, four, five, six, seven, eight, nine, ten.

B2

Further reading

Irish Mutations: Complete Guide to Séimhiú and Urú →Irish Pronunciation, The System Behind the Spelling →How to Learn Irish as an Adult, A Step-by-Step Roadmap →Best Irish Learning App 2026 →Browse all Irish vocabulary →

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Related Irish words

a dó

two (2)

a trí

three (3)

a ceathair

four (4)

a cúig

five (5)

a sé

six (6)

a seacht

seven (7)

a hocht

eight (8)

a naoi

nine (9)

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