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un

one (1)

numeralA1

"un" means "one (1)" in Welsh (numeral). Mutation forms: Treiglad Llaes → hun.

Mutation forms

In Welsh, the first letter of "un" changes depending on the grammatical context. These are the mutated forms:

MutationForm
Base formun
Treiglad Llaeshun

"un" in context

Nid yw un iaith byth yn ddigon.

One language is never enough.

A1

Mae gen i ddau frawd ac un chwaer.

I have two brothers and one sister.

B1

Gall berson dwyieithog newid o un iaith i iaith arall yng nghanol frawddeg, ac mae'r cyfnewid-cod hwn yn bwnc astudio i ieithyddion.

A bilingual person can change from one language to another in the middle of a sentence, and this code-switching is a topic of study for linguists.

B2

Cwestiwn: Ai gi neu gath yw Cwci? Ateb: Un o rhein.

Question: Is Cookie a dog or a cat? Answer: One of those.

A2

Mae un o gŵn fy ffrind yn dew.

One of my friend's dogs is fat.

A2

Further reading

Welsh Mutations Explained — Soft, Nasal & Aspirate →Welsh Pronunciation — It's Actually Easier Than English →How to Learn Welsh as an Adult — A Step-by-Step Roadmap →Best Apps to Learn Welsh (2026) →Browse all Welsh vocabulary →

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Related Welsh words

dau

two (2, masc.)

dwy

two (2, fem.)

tri

three (3, masc.)

tair

three (3, fem.)

pedwar

four (4, masc.)

pedair

four (4, fem.)

pump

five (5)

chwech

six (6)

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