Verb
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"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"4. set straight or right;
"remedy these deficiencies""rectify the inequities in salaries""repair an oversight"5. make right or correct;
"Correct the mistakes""rectify the calculation"6. convert into direct current;
"rectify alternating current"