A person or device that corrects something; someone whose job is to make corrections, such as a proofreader or editor.
From Latin 'corrector,' an agent noun from 'corrigere' (to set right), used since Roman times to describe someone with the job of making corrections.
Correctors in Renaissance printing were crucial gatekeepers of knowledge—they caught errors before books went to print, when fixing mistakes meant destroying whole pages by hand.
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