#1 rectify v. math: determine the length of; "rectify a curve". wn
#2 rectify v. [refine] reduce to a fine, unmixed, or pure state; separate from extraneous matter or cleanse from impurities; "refine sugar". wn
#3 rectify v. [reform, reclaim, regenerate] 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". wn
#4 rectify v. [remediate, remedy, repair, amend] set straight or right; "remedy these deficiencies"; "rectify the inequities in salaries"; "repair an oversight". wn
#5 rectify v. [correct, right] make right or correct; "Correct the mistakes"; "rectify the calculation". wn
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