It's important to note that "maîtresse" can have different meanings depending on the context:
* "Mistress": In a romantic context, "maîtresse" refers to a woman who is not married to the man she has a relationship with.
* "Teacher": In the context of education, "maîtresse" can refer to a female teacher, especially in elementary school.
* "Master": It can also be used in a more general sense to refer to a woman who is a master of a particular skill or profession.
It's always best to consider the context to understand the meaning of "maîtresse".