Here's what it means:
* In real estate: A mitoyenne property is a house or building that shares a common wall with another property. This is similar to a semi-detached house or townhouse in English.
* More generally: It can refer to anything that is shared, adjacent, or connected to something else.
Examples:
* "La maison est mitoyenne." (The house is semi-detached.)
* "Le jardin est mitoyen avec celui du voisin." (The garden is shared with the neighbor's.)
When translating "mitoyenne" into English, it's important to consider the context and choose the most appropriate term.