The Collaborative International Dictionary of English v.0.48:

Sanctity \Sanc"ti*ty\, n.; pl. Sanctities. [L. sanctitas, from
   sanctus holy. See Saint.]
   1. The state or quality of being sacred or holy; holiness;
      saintliness; moral purity; godliness.
      [1913 Webster]

            To sanctity she made no pretense, and, indeed,
            narrowly escaped the imputation of irreligion.
                                                  --Macaulay.
      [1913 Webster]

   2. Sacredness; solemnity; inviolability; religious binding
      force; as, the sanctity of an oath.
      [1913 Webster]

   3. A saint or holy being. [R.]
      [1913 Webster]

            About him all the sanctities of heaven. --Milton.
      [1913 Webster]

   Syn: Holiness; godliness; piety; devotion; goodness; purity;
        religiousness; sacredness; solemnity. See the Note under
        Religion.
        [1913 Webster]

WordNet (r) 3.0 (2006):

sanctity
    n 1: the quality of being holy [syn: holiness, sanctity,
         sanctitude] [ant: unholiness]

Moby Thesaurus II by Grady Ward, 1.0:

37 Moby Thesaurus words for "sanctity":
   Christianity, Christlikeness, Christliness, angelicalness,
   beauty of holiness, dedication, devotion, divinity, fear of God,
   godlikeness, godliness, godly-mindedness, goodness, grace,
   heavenliness, heavenly-mindedness, holiness, holy-mindedness,
   odor of sanctity, otherworldliness, piety, pureness,
   pureness of heart, purity, righteousness, sacredness, sainthood,
   saintlikeness, saintliness, saintship, sanctitude, seraphicalness,
   spiritual-mindedness, spirituality, unearthliness, unworldliness,
   uprightness