Definition
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Un
Yn cyfeirio at y rhif cyntaf yn yr ysgrifen neu'r cyfrif.
Referring to the first number in writing or counting.
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Mae un ci gennyf gartref.
I have one dog at home.
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Unwaith y byddi di'n barod, gallwn ddechrau.
Once you are ready, we can start.
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Cafodd un o'r myfyrwyr wobr.
One of the students received a prize.