The term "live-in lover" refers to a romantic partner who resides in the same home as the person they are in a relationship with. However, there are many other terms that can be used to describe this type of arrangement. Some more formal terms include cohabitation partner, domestic partner, or significant other. Colloquial terms may include boyfriend/girlfriend, partner, or companion. In some cultures, the term common-law partner may be used to refer to a live-in relationship that has legal recognition. Regardless of the term used, the important thing is that both partners are comfortable and happy with their living situation and the label used to describe it.