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rectification (n.)

c. 1400, rectificacioun, "a remedying, healing, improvement;" late 15c., "action of setting someone right in conduct or action, the correction of that which is wrong or erroneous;" from Old French rectificacion (14c.) or directly from Late Latin rectificationem (nominative rectificatio), noun of action from past participle stem of rectificare "make right; make straight" (see rectify).

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Definitions of rectification from WordNet

rectification (n.)
(chemistry) the process of refinement or purification of a substance by distillation;
rectification (n.)
the conversion of alternating current to direct current;
rectification (n.)
the act of offering an improvement to replace a mistake; setting right;
Synonyms: correction
rectification (n.)
determination of the length of a curve; finding a straight line equal in length to a given curve;
From wordnet.princeton.edu