@TRiG
This definition flies in the face of the connotation that 'live-in girlfriend' gives to me. Simply girlfriend means nearly nothing about the seriousness of the relationship. Two dumb 13-year-olds are boyfriend-girlfriend and so is my friend and his girlfriend who has been with the same woman for years and intends to for the rest of his life, however, he is against marriage for a number of reasons. They deserve different words.