Despite the various English dialects spoken from country to country and within different regions of the same country, there are only slight regional variations in English orthography, the two most not
An 1814 American medical text showing British spellings that were still in use (tumours, colour, centres)
Metre
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The metre is the base unit of length in the International System of Units. Since 2019, the metre has been defined as the length of the path travelled by light in vacuum during a time interval of 1/299
American and British English spelling differences
…tonne and long ton differ by only 1.6%, and are roughly interchangeable when accuracy is not critical short ton (2,000 pounds or 907 kilograms) N/A ton metre or meter unit of length a metre long metre meter also the international spelling for the unit according to the SI brochure by the BIPM measuring device a water…
Replicas of historical metric standards, including a copy of the Mètre des Archives