Source : Webster's Revised Unabridged Dictionary (1913)

Rotundity \Ro*tund"i*ty\, n. [L. rotunditas: cf. F.
   rotondit['e].]
   1. The state or quality of being rotu?; roundness;
      sphericity; circularity.

            Smite flat the thick rotundity o'the world! --Shak.

   2. Hence, completeness; entirety; roundness.

            For the more rotundity of the number and grace of
            the matter, it passeth for a full thousand.
                                                  --Fuller.

            A boldness and rotundity of speech.   --Hawthorne.

Source : WordNet®

rotundity
     n : the roundness of a 3-dimensional object [syn: {sphericity},
         {sphericalness}, {globosity}, {globularness}]