"Coopération" is French. I'm not sure what language "coöperation" is, but it's not English.
21 november 2014
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They are pronounced exactly the same way and mean the same thing, but we only use "co-operation" or "cooperation". Adding a diaeresis (oö) is not correct in this case.
21 november 2014
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Heb je je antwoorden nog steeds niet gevonden?
Schrijf je vragen op en laat de moedertaalsprekers je helpen!