1. (n.) 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.

2. (n.) Malignity; spitefulness; virulency.

abidingness aboriginality accustomedness age ancien regime ancientness antiquity atavism changelessness cobwebs of antiquity commonness confirmation confirmedness constancy customariness deep-rootedness deep-seatedness durability durableness duration dust of ages eld elderliness eldership embedment endurance entrenchment establishment firmness fixation fixedness fixity fixture frozenness great age habitualness hardening hoary age hoary eld immobility immovability immovableness immutability implantation infixion invariability invariableness inveterateness lastingness long standing old age old order old style oldness permanence permanency perpetualness persistence persistency prevalence primitiveness primogeniture primordialism primordiality quiescence rigidity senility seniority settledness solidity stability stabilization standing stasis steadfastness torpor unchangeability unchangingness venerableness wontedness