Source : Webster's Revised Unabridged Dictionary (1913)

Rectification \Rec`ti*fi*ca"tion\ (r?k`t?*f?*k?1sh?n), n. [Cf.
   F. rectification.]
   1. The act or operation of rectifying; as, the rectification
      of an error; the rectification of spirits.

            After the rectification of his views, he was
            incapable of compromise with profounder shapes of
            error.                                --De Quincey.

   2. (Geom.) The determination of a straight line whose length
      is equal a portion of a curve.

   {Rectification of a globe} (Astron.), its adjustment
      preparatory to the solution of a proposed problem.

Source : WordNet®

rectification
     n 1: (chemistry) the process of refinement or purification of a
          substance by distillation
     2: the conversion of alternating current to direct current
     3: the act of offering an improvement to replace a mistake;
        setting right [syn: {correction}]
     4: determination of the length of a curve; finding a straight
        line equal in length to a given curve