Meaning of cei?

[psionpete]

The course translates Cei as Yes, but when I search both my Dictionaries and the web I get the translation Cei = Quay.

Which is correct?

[StephenJones2]

Both are correct. 'Cei' means 'Yes, you can have' or 'Yes, you shall'. 'Cei' also means 'quay', a Norman French word that Cymraeg presumably acquired via Middle English.

[psionpete]

Many thanks, that was very useful.

[RIK-6075]

Could this be a possible origin for the term okay? O cei?