disorder or disease occurring over a long period of time (contrast with acute).

Merriam-Webster Online Dictionary
chronic (adjective)
a) marked by long duration or frequent recurrence not acute - chronic indigestion chronic experiments
b) suffering from a chronic disease - the special needs of chronic patients
a) always present or encountered , especially constantly vexing, weakening, or troubling - chronic petty warfare
b) being such habitually - a chronic grumbler inveterate
chronic (Wikipedia)

Chronic may refer to:

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