rectify -- (math: determine the length of; "rectify a curve")
refine, rectify -- (reduce to a fine, unmixed, or pure state; separate from extraneous matter or cleanse from impurities; "refine sugar")
reform, reclaim, regenerate, rectify -- (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")
rectify, remediate, remedy, repair, amend -- (set straight or right; "remedy these deficiencies"; "rectify the inequities in salaries"; "repair an oversight")
correct, rectify, right -- (make right or correct; "Correct the mistakes"; "rectify the calculation")
rectify -- (convert into direct current; "rectify alternating current")
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