"Mae hi'n un ar ddeg o'r gloch."

Translation: It is eleven o'clock.

[Ash473779]

I swear I learned it already but can someone please remind me what exactly 'ar' translates to in english?

[ibisc]

It depends on the context. Generally it is a preposition meaning 'on', but that is not to say that it is always best translated like that:

• Mae'r gath yn eistedd ar y bwrdd - The cat is sitting on the table.
• Un ar ddeg (= Un deg un) - Eleven ( the traditional un ar ddeg version is generally still used with time).

There are other uses of ar as well which you may come across from time to time.

[Ash473779]

Thanks for all your help Ibisc!

[polly-thomas]

That's really useful. Diolch!