What process is referred to when making something correct or accurate?

The term "rectify" specifically refers to the process of making something correct or accurate. It implies a corrective action to amend errors or inaccuracies. For example, if a mistake is made in a calculation, one would rectify that error by correcting it to ensure the result is accurate. This concept is commonly used in various contexts, such as mathematics, law, or any area where adjustments are needed to achieve correctness.

In contrast, the other terms do not convey the same meaning. "Plod" suggests a slow and tedious movement or progress, lacking any implication of correction. "Retard" means to slow down or delay something, often in a negative context, while "sever" refers to cutting off or breaking something apart. None of these alternatives encapsulate the idea of correcting or improving an error as effectively as "rectify" does.