From hagiazo; properly, purification, i.e. (the state) purity; concretely (by Hebraism) a purifier -- holiness, sanctification.
see GREEK hagiazo
1. consecration, purification, τό ἁγιάζειν.
2. the effect of consecration: sanctification of heart and life, 1 Corinthians 1:30 (Christ is he to whom we are indebted for sanctification); 1 Thessalonians 4:7; Romans 6:19, 22; 1 Timothy 2:15; Hebrews 12:14; ἁγιασμός πνεύματος sanctification wrought by the Holy Spirit, 2 Thessalonians 2:13; 1 Peter 1:2. It is opposed to lust in 1 Thessalonians 4:3f. (It is used in a ritual sense, Judges 17:3 (Alexandrian LXX); Ezekiel 45:4; (Amos 2:11); Sir. 7:31, etc.) (On its use in the N. T. cf. Ellicott on 1 Thessalonians 4:3; 1 Thessalonians 3:13.)