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rectify (v.)

c. 1400, rectifien, "to cure, heal, remedy" (a bad or faulty condition); early 15c. "set (someone) straight in conduct or behavior;" late 15c., "correct an error, set (something) straight or right;" from Old French rectifier, literally "to make straight" (14c.), from Late Latin rectificare "make right, make straight," from Latin rectus "straight" (from PIE root *reg- "move in a straight line," with derivatives meaning "to direct in a straight line") + combining form of facere "to make" (from PIE root *dhe- "to set, put"). Sense of "remove impurities from a distillate" is from mid-15c. Related: Rectified; rectifying.

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Definitions of rectify from WordNet

rectify (v.)
math: determine the length of;
rectify a curve
rectify (v.)
reduce to a fine, unmixed, or pure state; separate from extraneous matter or cleanse from impurities;
Synonyms: refine
rectify (v.)
bring, lead, or force to abandon a wrong or evil course of life, conduct, and adopt a right one;
Synonyms: reform / reclaim / regenerate
rectify (v.)
set straight or right;
rectify the inequities in salaries
Synonyms: remediate / remedy / repair / amend
rectify (v.)
make right or correct;
rectify the calculation
Synonyms: correct / right
rectify (v.)
convert into direct current;
rectify alternating current
From wordnet.princeton.edu