The correct spellings and grammar of English words may only be found in an English dictionary, from England.
If you were to consult an American version of the English dictionary, you would find many perversions of our language within.
Why do the Americans insist that their spellings are correct just because their country is bigger than England? We spoke it first, we spelt it first, we wrote the first dictionary, the language is called English, when did 'Americanism' first enter our language? Who was the first fool to miss off the U in 'colour,' the S in 'maths,' the I in 'Aluminium' and the UE in 'analogue?'
It's so unfortunate...