Source : Webster's Revised Unabridged Dictionary (1913)

Rectify \Rec"ti*fy\ (-f?), v. t. [imp. & p. p. {Rectified}
   (-f?d); p. pr. & vb. n. {Rectifying} (-f?`?ng).] [F.
   rectifier, LL. rectificare; L. rectus right + -ficare (in
   comp.) to make. See {Right}, and {-fy}.]
   1. To make or set right; to correct from a wrong, erroneous,
      or false state; to amend; as, to rectify errors, mistakes,
      or abuses; to rectify the will, the judgment, opinions; to
      rectify disorders.

            I meant to rectify my conscience.     --Shak.

            This was an error of opinion which a conflicting
            opinion would have rectified.         --Burke.

   2. (Chem.) To refine or purify by repeated distillation or
      sublimation, by which the fine parts of a substance are
      separated from the grosser; as, to rectify spirit of wine.

   3. (Com.) To produce ( as factitious gin or brandy) by
      redistilling low wines or ardent spirits (whisky, rum,
      etc.), flavoring substances, etc., being added.

Source : WordNet®

rectify
     v 1: math: determine the length of; "rectify a curve"
     2: reduce to a fine, unmixed, or pure state; separate from
        extraneous matter or cleanse from impurities; "refine
        sugar" [syn: {refine}]
     3: bring, lead, or force to abandon a wrong or evil course of
        life, conduct, and adopt a right one; "The Church reformed
        me"; "reform your conduct" [syn: {reform}, {reclaim}, {regenerate}]
     4: set straight or right; "remedy these deficiencies"; "rectify
        the inequities in salaries"; "repair an oversight" [syn: {remediate},
         {remedy}, {repair}, {amend}]
     5: make right or correct; "Correct the mistakes"; "rectify the
        calculation" [syn: {correct}, {right}] [ant: {falsify}]
     6: convert into direct current; "rectify alternating current"
     [also: {rectified}]