Fellow Student was a Talmud

Talmud

The Talmud is a central text of mainstream Judaism. It takes the form of a record of rabbinic discussions pertaining to Jewish law, ethics, philosophy, customs and history....

ist epithet commonly used to describe the interim status of a disciple between the status of being merely a disciple of a teacher Rabbi and being practically equal in status. In many cases, a Fellow Student didn't fall short of his Rabbi, however he continues to perceive his teacher Rabbi above him and continues to learn from him. The term was commonly used in the Talmud

Talmud

The Talmud is a central text of mainstream Judaism. It takes the form of a record of rabbinic discussions pertaining to Jewish law, ethics, philosophy, customs and history....

 times, however, the usage was continued throughout the Middle Ages

Middle Ages

The Middle Ages is a periodization of European history from the 5th century to the 15th century. The Middle Ages follows the fall of the Western Roman Empire in 476 and precedes the Early Modern Era. It is the middle period of a three-period division of Western history: Classic, Medieval and Modern...

and in latter times.