Corrector

A corrector (English plural correctors) is a person who or object that practices correction, usually by removing or rectifying errors.

The word is originally a Roman title corrector, derived from the Latin verb corrigere, meaning "to make straight, set right, bring into order."

Apart from the general sense of anyone who corrects mistakes, it has been used as, or part of (some commonly shortened again to Corrector), various specific titles and offices, sometimes quite distant from the original meaning.

Secular offices

Roman Antiquity

The office of corrector first appears in the Principate in the reign of Trajan (r. 98–117), for extraordinary officials of senatorial rank, who were tasked with investigating and reforming the administration in the provinces. To this end, they were entrusted with full imperium maius, which extended also to territories normally exempt from the authority of the Emperor's provincial governors: the free cities of the Greek East, the senatorial provinces, as well as Italy herself. The title of these officials, from their institution to the end of the 3rd century, was in Latin legatus Augusti pro praetore [missus] ad corrigendum [ordinandum] statum, in Greek rendered as πρεσβευτὴς καἰ ἀντιστράτηγος Σεβαστοῦ διορθωτὴς [or ἐπανορθωτὴς] (presbeutes kai antistrategos Sebastou diorthotes/epanorthotes). From the late 3rd century on, the title was increasingly, and afterwards exclusively, simplified as corrector in Latin and διορθωτὴς (or ἐπανορθωτὴς) in Greek.