[adverb] [not gradable] - a word written in brackets after a word or phrase that has been copied from somewhere else and is spelled or used wrongly. Writers use this word to tell readers that they know that the original text contains a mistake.The notice outside the cinema said 'Closed on Wedensday' (sic) (= Wednesday is spelled wrong).
SIC
Meaning of SIC in English
Cambridge English vocab. Кембриджский английский словарь. 2012