correction

(noun) the act of offering an improvement to replace a mistake; setting right. Synonyms: rectification.

(noun) a quantity that is added or subtracted in order to increase the accuracy of a scientific measure. Synonyms: fudge factor.

(noun) something substituted for an error.

(noun) a rebuke for making a mistake. Synonyms: chastening, chastisement.

(noun) a drop in stock market activity or stock prices following a period of increases. Example: "Market runups are invariably followed by a correction."

(noun) the act of punishing. Synonyms: discipline. Example: "The offenders deserved the harsh discipline they received."

(noun) treatment of a specific defect. Example: "The correction of his vision with eye glasses."