What does "sanctify" mean?

Additional senses

1. 2.2. To make free from sin; to cleanse from moral corruption and pollution; to purify. Sanctify them through thy truth. John xvii.
2. 3.3. To make efficient as the means of holiness; to render productive of holiness or piety. A means which his mercy hath sanctified so to me as to make me repent of that unjust act. Eikon Basilike.
3. 4.To impart or impute sacredness, venerableness, inviolability, title to reverence and respect, or the like, to; to secure from violation; to give sanction to. The holy man, amazed at what he saw, Made haste to sanctify the bliss by law. Dryden. Truth guards the poet, sanctifies the line. Pope.