What is the difference between "God kveld" and "God aften!" in Norwegian?
Both greetings' English translations are "Good evening!" Is there any difference between them? If there's, then what?

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Both are interjections in Norwegian, having same meaning as you have mentioned. You can use any of them to your like.

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No, there is no difference in the meaning of the two expressions, but "God kveld" is more commonly used.

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They mean the same! But God Aften is a little old fashioned :]