The Collaborative International Dictionary of English v.0.48:

Spirituality \Spir`it*u*al"i*ty\, n.; pl. Spiritualities. [L.
   spiritualitas: cf. F. spiritualit['e].]
   1. The quality or state of being spiritual; incorporeality;
      heavenly-mindedness.
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            A pleasure made for the soul, suitable to its
            spirituality.                         --South.
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            If this light be not spiritual, yet it approacheth
            nearest to spirituality.              --Sir W.
                                                  Raleigh.
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            Much of our spirituality and comfort in public
            worship depends on the state of mind in which we
            come.                                 --Bickersteth.
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   2. (Eccl.) That which belongs to the church, or to a person
      as an ecclesiastic, or to religion, as distinct from
      temporalities.
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            During the vacancy of a see, the archbishop is
            guardian of the spiritualities thereof.
                                                  --Blackstone.
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   3. An ecclesiastical body; the whole body of the clergy, as
      distinct from, or opposed to, the temporality. [Obs.]
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            Five entire subsidies were granted to the king by
            the spirituality.                     --Fuller.
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WordNet (r) 3.0 (2006):

spirituality
    n 1: property or income owned by a church [syn: spiritualty,
         spirituality, church property]
    2: concern with things of the spirit [syn: spirituality,
       spiritualism, spiritism, otherworldliness] [ant:
       worldliness]

Moby Thesaurus II by Grady Ward, 1.0:

56 Moby Thesaurus words for "spirituality":
   Christianity, Christlikeness, Christliness, angelicalness,
   beauty of holiness, bliss, bodilessness, fear of God, ghostliness,
   godlikeness, godliness, godly-mindedness, goodness, harmony,
   heavenliness, heavenly-mindedness, holiness, holy-mindedness,
   immateriality, immaterialness, impalpability, imponderability,
   incorporeality, incorporeity, inextension, intangibility,
   nonexteriority, occult phenomena, occultism, odor of sanctity,
   otherworldliness, psychical research, psychicism, psychics,
   psychism, pureness, pureness of heart, purity, righteousness,
   sainthood, saintlikeness, saintliness, saintship, sanctitude,
   sanctity, seraphicalness, shadowiness, spirit world,
   spiritual-mindedness, spirituousness, supernaturalism, the occult,
   unearthliness, unsubstantiality, unsubstantialness,
   unworldliness