A "maîtresse" is a French term that translates to "mistress" in English. It typically refers to a woman who is in a romantic or sexual relationship with a man who is married to someone else. This relationship often exists outside of traditional marriage norms and can involve emotional and financial support. In historical contexts, particularly in French aristocracy, maîtresses held significant influence and power. They could be involved in political affairs and social gatherings, sometimes even shaping the decisions of their partners. Famous maîtresses, like Madame de Pompadour, were known for their roles in the courts of kings, showcasing the complex dynamics of such relationships.