A girlfriend is term for a female partner one is romantically or sexually involved with. It can also refer to a female friend.
This term is often used loosely, and there is some debate over what exactly constitutes a girlfriend.
Partners in committed non-marital relationships are also sometimes described as a significant other or simply partner, especially if the individuals are cohabiting.
Girlfriend and partner mean different things to different people; the distinctions between the terms are subjective. How the term is used will ultimately be determined by personal preference.
A 2005 study of 115 people ages 21 to 35 who were either living with or had lived with a romantic partner notes that the lack of proper terms often leads to awkward situations, such as someone upset over not being introduced in social situations to avoid the question.
In a strictly grammatical sense, a “girlfriend” or “boyfriend” is an individual with whom one shares a romantic relationship. A “girl friend” or…