Jisho

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Noun
1. legal wife (of a noble) (as opposed to a concubine)See also 側室, See also 本妻
Noun
2. room for receiving guestsSee also 表座敷 おもてざしき
Noun
3. heir; successorRare term
Wikipedia definition
4. SeishitsuSeishitsu (正室) is the Japanese term of the Edo period for the official wife of high-ranking persons. The tennō, kugyō (court officials), shogun and daimyo often had several wives to ensure the birth of an heir. The seishitsu had a status above other wives, called sokushitsu. The system dates back to the ritsuryō system in the Nara and Heian periods. At the time, the main wife was called chakusai (嫡妻). The last Japanese emperor to have official concubines was Emperor Meiji.
Read “Seishitsu” on English Wikipedia
Read “正室” on Japanese Wikipedia
Read “Seishitsu” on DBpedia

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