Source : Webster's Revised Unabridged Dictionary (1913)

Variorum \Va`ri*o"rum\, a. [L., abbrev. fr. cum notis variorum
   with notes of various persons.]
   Containing notes by different persons; -- applied to a
   publication; as, a variorum edition of a book.

Source : WordNet®

variorum
     n : an edition containing various versions of a text or notes by
         various scholars or editors [syn: {variorum edition}]