rectify
Cross references: 1. correct rec.ti.fy \'rek-t*-.fi-\ vt [ME rectifien, fr. MF rectifier, fr. ML rectificare, fr. L Xrectus right 1: to set right : REMEDY 2: to purify (as alcohol) esp. by repeated or fractional distillation 3: to correct by removing errors : ADJUST {~ the calendar)> 4: to make (an alternating current) unidirectional