From The Art and Popular Culture Encyclopedia
Female dominance (or Femdom) refers to BDSM activities where the dominant partner is female; the submissive partner may be of either sex. It can also refer to relationships that do not self-identify as BDSM, yet remain based on consensual power exchange or dominance and submission wherein a woman assumes a traditionally dominant role. A dominant woman is sometimes called a domme , femdomme, domina, or dominatrix. In the English-speaking world, "mistress" is by far the most common dominatrix title, while in most of continental Europe, the most common titles are maitresse, maid, maidress, matress, mother, mate, madre, or momina . The most common dominatrix title in the Spanish language is "ama." The equivalent Japanese term is 女王様 (joōsama, or queen).