rectify

from The American Heritage® Dictionary of the English Language, 5th Edition.

• transitive verb To set right; correct: synonym: correct.
• transitive verb To correct by calculation or adjustment.
• transitive verb Chemistry To refine or purify, especially by distillation.
• transitive verb Electronics To convert (alternating current) into direct current.
• transitive verb To adjust (the proof of alcoholic beverages) by adding water or other liquids.

from The Century Dictionary.

• 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.
• Hence— To bring (a. spirit) by repeated distillation to the strength required, and at the same time to impart to it the desired flavor. See rectifier.
• In chemical manuf. and in pharmacy:
• To separate impurities from (a crystalline body) by dissolving and recrystallizing it, sometimes repeatedly, and sometimes also with intermediate washing of the crystals.
• To raise (a liquid) to a prescribed strength by extraction of some part of its liquid components.
• To remove impurities from (solutions) by filtering them through substances absorbent of dissolved impurities, but non-absorbent of, and chemically inactive upon, the substance to be purified. Of such materials bone-black is a typical example, especially in sugar-refining
• To purify by one or more resublimations.
• In mathematics, to determine the length of (a curve, or a part of a curve) included between two limits.
• In the use of the globes, to place (a globe) in such a position that the solution of a given problem may be effected with it.
• Synonyms Improve, Better, etc. (see amend), redress, adjust, regulate.

from the GNU version of the Collaborative International Dictionary of English.

• transitive verb To make or set right; to correct from a wrong, erroneous, or false state; to amend
• transitive verb (Chem.) To refine or purify by repeated distillation or sublimation, by which the fine parts of a substance are separated from the grosser.
• transitive verb (Com.) To produce ( as factitious gin or brandy) by redistilling low wines or ardent spirits (whisky, rum, etc.), flavoring substances, etc., being added.
• transitive verb to adjust it in order to prepare for the solution of a proposed problem.

from Wiktionary, Creative Commons Attribution/Share-Alike License.

• verb transitive To correct or amend something.
• verb transitive, chemistry To purify or refine, especially by distillation.
• verb transitive, electronics To convert alternating current into direct current.

from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.

• verb set straight or right
• verb reduce to a fine, unmixed, or pure state; separate from extraneous matter or cleanse from impurities
• verb math: determine the length of
• verb bring, lead, or force to abandon a wrong or evil course of life, conduct, and adopt a right one
• verb make right or correct
• verb convert into direct current