This noun denotes purity, particularly in moral and sexual conduct—holiness that manifests in chastity and clean living. In Paul's pastoral letters to Timothy, it appears twice: among qualities Timothy should model (1 Timothy 4:12) and as the attitude with which he should treat younger women, as sisters 'in all purity' (5:2). The word emphasizes not merely ritual cleanness but moral integrity, especially sexual self-control and appropriate boundaries. It's the quality of one whose conduct is undefiled, whose relationships honor proper limits, whose character reflects holiness in practical life.