What is the correct spelling of meter?

Answer 1

Metre is the British spelling

Meter is the American spelling

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There are a great number of English words that have different spelling in "English" English and in "American" English.

Words that end in "er" in American are frequently spelled with "re" in English. So in the US, we spell it "meter" while the English spell it "metre". Also, "theater" vs "theatre".

Also, the English apparently have a lot of "u"s in the storage shed that they are trying to get rid of. And they toss them into many words that don't require a "u", like "labour" instead of "labor".

In fact, right here in WikiAnswers, I can see that the words "metre" and "labour" are marked as misspelled, which proves that we're right and they're wrong. :-)