- (of an illness) persisting for a long time or constantly recurring:chronic bronchitisOften contrasted with acute.
late Middle English: from French chronique, via Latin from Greek khronikos 'of time', from khronos 'time'
Chronic is often used to mean ‘habitual, inveterate,’ e.g., a chronic liar. Some consider this use incorrect. The precise meaning of chronic is ‘persisting for a long time,’ and it is used chiefly of illnesses or other problems: more than one million people in the US have chronic bronchitis.