Also known as: 熟女, 人妻, ママン, おばさん, milf, 母性的女体, 年増, お姉さん, 既婚女性, 熟女化, 経産婦
A "middle-aged" or older woman. Common traits include Mature Eyes, slight face wrinkles, a noticeable Belly, and an overall body shape that's generally curvier than that of a younger woman.
Alternate terms, depending on age range, can include cougar, hag, or MILF (Mother I'd Like to Fuck; used regardless of the fact whether she's had children or not).
A woman that is said to be a mother or shown with her own children does not automatically make her a mature female. She must look like an older woman to count.