Merriam-Webster Collegiate Dictionary - rectify

 transitive verb  (-fied; -fying)  Etymology: Middle English rectifien, from Anglo-French rectifier, from Medieval Latin rectificare, from Latin rectus right — more at right  Date: 14th century  1. to set right ; remedy  2. to purify (as alcohol) especially by repeated or fractional distillation  3. to correct by removing errors ; adjust ~ the calendar  4. to make (an alternating current) unidirectional  Synonyms: see correct  • rectification noun