| verb | math: determine the length of “rectify a curve” |
| verb | reduce to a fine, unmixed, or pure state; separate from extraneous matter or cleanse from impurities “refine sugar” |
| verb | bring, lead, or force to abandon a wrong or evil course of life, conduct, and adopt a right one “The Church reformed me” |
| verb | set straight or right “remedy these deficiencies” |
| verb | make right or correct “Correct the mistakes” |
| verb | convert into direct current “rectify alternating current” |
| rectification | noun | determination of the length of a curve; finding a straight line equal in length to a given curve |
| refinement | noun | the process of removing impurities (as from oil or metals or sugar etc.) |
| refiner | noun | one whose work is to refine a specific thing |
| refining | noun | the process of removing impurities (as from oil or metals or sugar etc.) |
| reformative | adjective | tending to reform |
| reformatory | adjective | tending to reform |
| reform | noun | self-improvement in behavior or morals by abandoning some vice |
| reformist | noun | a disputant who advocates reform |
| reformation | noun | rescuing from error and returning to a rightful course |
| reclamation | noun | rescuing from error and returning to a rightful course |
| rectifier | noun | a person who corrects or sets right |
| remediation | noun | act of correcting an error or a fault or an evil |
| remedy | noun | act of correcting an error or a fault or an evil |
| reparation | noun | something done or paid in expiation of a wrong |
| amendable | adjective | capable of being corrected by additions |
| correction | noun | the act of offering an improvement to replace a mistake; setting right |