Quote:
METER is the preferred spelling in the US
METRE is used everywhere else.
Actually the only European languages that spell it metre is French, Catalan, British English and Turkish.
In
German, Dutch, Danish, Norwegian, Swedish, Slovak, Slovenian and Albanian, it is spelled meter.
Metro is the spelling in Spanish, Portuguese, Galician, Basque and Italian.
Other languages have different spellings such as metr in Polish, Czech and Welsh or metra in Icelandic. That doesn't even take in to account other alphabets such as Greek, Cyrillic, Arabic, Devanagari, etc.