Source : Webster's Revised Unabridged Dictionary (1913)

Multifariousness \Mul`ti*fa"ri*ous*ness\, n.
   1. Multiplied diversity.

   2. (Law) The fault of improperly uniting in one bill distinct
      and independent matters, and thereby confounding them.
      --Burrill.

Source : WordNet®

multifariousness
     n : noticeable heterogeneity; "a diversity of possibilities";
         "the range and variety of his work is amazing" [syn: {diverseness},
          {diversity}, {variety}]