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In page Prefectures of Japan:

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The West's use of "prefecture" to label these Japanese regions stems from 16th-century Portuguese explorers and traders use of "prefeitura" to describe the fiefdoms they encountered there.[citation needed] Its original sense in Portuguese, however, was closer to "municipality" than "province". Today, in turn, Japan uses its word ken (), meaning "prefecture", to identify Portuguese districts while in Brazil the word "Prefeitura" is used to refer to a city hall.