This noun denotes the state or quality of being pure, whether physical cleanliness, moral integrity, or ceremonial fitness. In Hebrews 9:13, it refers to 'the purity (katharotēta) of the flesh' achieved through Old Covenant rituals—the sprinkling of ashes from a red heifer and animal blood that sanctified the ceremonially defiled. The word highlights the external, physical cleansing these rituals provided, contrasting with the deeper conscience-cleansing Christ's blood accomplishes. Outward purity pointed toward the need for inward purification.