The Collaborative International Dictionary of English v.0.48:

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.
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            I meant to rectify my conscience.     --Shak.
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            This was an error of opinion which a conflicting
            opinion would have rectified.         --Burke.
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   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.
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   3. (Com.) To produce ( as factitious gin or brandy) by
      redistilling low wines or ardent spirits (whisky, rum,
      etc.), flavoring substances, etc., being added.
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   To rectify a globe, to adjust it in order to prepare for
      the solution of a proposed problem.
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   Syn: To amend; emend; correct; better; mend; reform; redress;
        adjust; regulate; improve. See Amend.
        [1913 Webster] Rectilineal