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From Biology-Online Dictionary
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1. Firm establishment by long continuance; firmness or deep-rooted obstinacy of any quality or state acquired by time; as, the inveteracy of custom, habit, or disease; usually in a bad sense; as, the inveteracy of prejudice or of error. An inveteracy of evil habits that will prompt him to contract more. (a. Tucker)

2. Malignity; spitefulness; virulency. The rancor of pamphlets, the inveteracy of epigrams, an the mortification of lampoons. (Guardian)

Origin: From inveterate.