Oxford University to my knowledge are charged with keeping the dictionary updated. Cambridge University tend to be the awarding body for qualifications in English for overseas students. Thats in the UK what happens in the USA I don't know.
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ddhhzIs there some kind of official reference for English grammar?
In case no master reference is existing, which source do you suggest in order to become good as nearly as a native speaker?
You've come to the right source. This is it.