The Japanese name konsento (コンセント) for electric sockets is said to originate from the English "concentric plug" in the form konsentorikku puragu (コンセントリックプラグ).[1]
Some British sockets from around 1900 consisted of concentric (co-axial) contacts, unlike the pinned ones in use today. These were in use in Meiji period (1868-1912) Japan, and the abbreviated form konsento became the accepted way to describe any kind of electrical outlet. This may have been from a split of konsento puragu into konsento to describe the outlet and puragu to describe the plug.
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