British spelling plural of caliber; diameters of gun barrels or bullets, or levels of quality and ability.
British variant plural of caliber, maintaining the French-influenced spelling 'calibre.' This reflects the British English tradition of preserving French spelling conventions more closely than American English.
When British and American scientists discuss guns or measurements, they're using the same word but different spellings—it's a tiny reminder that the British Empire spread English far enough that it split into several consistent dialects!
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