Source : Webster's Revised Unabridged Dictionary (1913)

Disproportion \Dis`pro*por"tion\, n. [Pref. dis- + proportion:
   cf. F. disproportion.]
   1. Want of proportion in form or quantity; lack of symmetry;
      as, the arm may be in disproportion to the body; the
      disproportion of the length of a building to its height.

   2. Want of suitableness, adequacy, or due proportion to an
      end or use; unsuitableness; disparity; as, the
      disproportion of strength or means to an object.

Disproportion \Dis`pro*por"tion\, v. t. [imp. & p. p.
   {Disproportioned}; p. pr. & vb. n. {Disproportioning}.]
   To make unsuitable in quantity, form, or fitness to an end;
   to violate symmetry in; to mismatch; to join unfitly.

         To shape my legs of an unequal size; To disproportion
         me in every part.                        --Shak.

         A degree of strength altogether disproportioned to the
         extent of its territory.                 --Prescott.

Source : WordNet®

disproportion
     n : lack of proportion; imbalance among the parts of something
         [ant: {symmetry}]