rectify

To set right; correct: synonym: correct.

To correct by calculation or adjustment.

To refine or purify, especially by distillation.

To convert (alternating current) into direct current.

To adjust (the proof of alcoholic beverages) by adding water or other liquids.

In electricity, to change (an alternating electric current) into a direct current by redirecting the successively opposite impulses of the alternating current so as to flow in the same direction. See rectifier .

To make right or straight; correct when wrong, erroneous, or false; amend: as, to rectify errors, mistakes, or abuses: sometimes applied to persons.

Specifically In distilling:

To remove impurities from (an alcoholic distillate) and raise to a required proof or strength by repeated distillation.