The Collaborative International Dictionary of English v.0.48:

Diversity \Di*ver"si*ty\, n.; pl. Diversities. [F.
   diversit['e], L. diversitas, fr. diversus. See Diverse.]
   1. A state of difference; dissimilitude; unlikeness.
      [1913 Webster]

            They will prove opposite; and not resting in a bare
            diversity, rise into a contrariety.   --South.
      [1913 Webster]

   2. Multiplicity of difference; multiformity; variety.
      "Diversity of sounds." --Shak. "Diversities of opinion."
      --Secker.
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   3. Variegation. "Bright diversities of day." --Pope.

   Syn: See Variety.
        [1913 Webster]

WordNet (r) 3.0 (2006):

diversity
    n 1: noticeable heterogeneity; "a diversity of possibilities";
         "the range and variety of his work is amazing" [syn:
         diverseness, diversity, multifariousness, variety]
    2: the condition or result of being changeable