Chou Collection, Lower Volume
Radical: Woman (nǚ)
Entry: 媐
Kangxi stroke count: 12
Page 266, Entry 34
Broad Rhymes (Guangyun): Pronounced yi. Collected Rhymes (Jiyun): Pronounced yi. The pronunciation is yi.
Explanation in the Explaining Graphs and Analyzing Characters (Shuowen Jiezi): It means to be joyful and happy.
Also, Broad Rhymes (Guangyun): Pronounced xi. Collected Rhymes (Jiyun): Pronounced xi. The meaning is the same. It is also interchangeable with the character for consort (fei).
From the Great Mystery (Taixuanjing) by Yangzi: A noble person makes use of marrying a woman (xi), treats the marriage with caution, is initially upright, and later finds peace. Commentary: A woman is called (xi). (Xi) is the same as consort (fei), and it is also the same as a spouse (qiu).