侍じ妾しょう

noun

concubine; mistress

Historical term for a woman in a recognized but secondary marital-like relationship, often in aristocratic or samurai contexts. Not used for modern extramarital affairs.

• 江え戸ど時じ代だい、大だい名みょうには正せい室しつのほかに侍じ妾しょうがいることもあった。

  In the Edo period, a daimyo sometimes had a concubine in addition to his legal wife.