Jisho

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Noun
1. go-on; Wu reading; on reading of a kanji based on 5th and 6th century ChineseSee also 漢音 かんおん, See also 唐音 とうおん, See also 呉 ご
Wikipedia definition
2. Go-onare one of the different readings of Japanese kanji. They are old pronunciations of Chinese characters, believed to be taken from China to Japan prior to the importation (by the Kenzuishi envoy to the Sui dynasty and monks studying abroad) of "kan-on" readings from Chang'an during the Nara period. Like kan-on readings, they are said to display the characteristics of Middle Chinese.
Read “Go-on” on English Wikipedia
Read “呉音” on Japanese Wikipedia
Read “Go-on” on DBpedia

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