Jisho

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Noun
1. mountain castleSee also 平城
Wikipedia definition
2. Rocca (architecture)Rocca is an Italian term meaning a high, fortifiable stronghold, usually located in smaller towns, beneath or on which the village or town clustered, within which its inhabitants might take refuge at times of trouble; under its owners' patronage the settlement might hope to find prosperity in better times. A rocca might in reality be no grander than a fortified farmhouse. A more extensive rocca would be referred to as a castello.
Read “Rocca (architecture)” on English Wikipedia
Read “山城” on Japanese Wikipedia
Read “Rocca (architecture)” on DBpedia
Other forms
山城 【さんじょう】

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