1) Bibliography 2) Edition 3) Variorum edition 
A variorum is a work that collates all known variants of a text. It is a work of textual criticism, whereby all variations and emendations are set side by side so that a reader can track how textual decisions have been made in the preparation of a text for publication. The Bible and the works of William Shakespeare have often been the subjects of ...
including the notes of earlier scholars or editors
• (a.) Containing notes by different persons; -- applied to a publication; as, a variorum edition of a book.
A variorum edition is any published version of an author's work that contains notes and comments by
Va`ri·o'rum adjective [ Latin , abbrev. from cum notis variorum with notes of various persons.] Containing notes by different persons; -- applied to a publication; as, a variorum edition of a book. 
[adj] - containing various versions of a text of notes by various scholars 2. [n] - an edition containing various versions of a text or notes by various scholars or editors
denoting comments/interpretations by various people, or denoting a publication which contains different interpretations/readings of the original work - consequently a variorum or variorum edition refers to a publication which provides variant readings/interpretations of, and comments by different scholars on, a work of some sort
variorum edition noun an edition containing various versions of a text or notes by various scholars or editors