(ōld′gûrl′)n. An informal, exclusive system of mutual assistance and friendship through which women belonging to a particular group, such as the alumnae of a school, exchange favors and connections, as in politics or business: "Companies rely on an old-girl network whereby representatives use friends as contacts"(New York Times).
old′-girl′ net`work
n. an association among women that is comparable to or modeled on an old-boy network.