The Collaborative International Dictionary of English v.0.48:

Spiritual \Spir"it*u*al\, a. [L. spiritualis: cf. F. spirituel.
   See Spirit.]
   1. Consisting of spirit; not material; incorporeal; as, a
      spiritual substance or being.
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            It is sown a natural body, it is raised a spiritual
            body.                                 --1 Cor. xv.
                                                  44.
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   2. Of or pertaining to the intellectual and higher endowments
      of the mind; mental; intellectual.
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   3. Of or pertaining to the moral feelings or states of the
      soul, as distinguished from the external actions; reaching
      and affecting the spirits.
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            God's law is spiritual; it is a transcript of the
            divine nature, and extends its authority to the acts
            of the soul of man.                   --Sir T.
                                                  Browne.
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   4. Of or pertaining to the soul or its affections as
      influenced by the Spirit; controlled and inspired by the
      divine Spirit; proceeding from the Holy Spirit; pure;
      holy; divine; heavenly-minded; -- opposed to carnal.
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            That I may impart unto you some spiritual gift.
                                                  --Rom. i. ll.
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            Blessed be the God and Father of our Lord Jesus
            Christ, who hath blessed us with all spiritual
            blessings.                            --Eph. i. 3.
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            If a man be overtaken in a fault, ye which are
            spiritual, restore such an one.       --Gal. vi. 1.
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   5. Not lay or temporal; relating to sacred things;
      ecclesiastical; as, the spiritual functions of the clergy;
      lords spiritual and temporal; a spiritual corporation.
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   Spiritual coadjuctor. (Eccl.) See the Note under Jesuit.


   Spiritual court (Eccl. Law), an ecclesiastical court, or a
      court having jurisdiction in ecclesiastical affairs; a
      court held by a bishop or other ecclesiastic.
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The Collaborative International Dictionary of English v.0.48:

Spiritual \Spir"it*u*al\, n.
   A spiritual function, office, or affair. See Spirituality,
   2.
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         He assigns supremacy to the pope in spirituals, and to
         the emperor in temporals.                --Lowell.
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WordNet (r) 3.0 (2006):

spiritual
    adj 1: concerned with sacred matters or religion or the church;
           "religious texts"; "a member of a religious order";
           "lords temporal and spiritual"; "spiritual leaders";
           "spiritual songs" [syn: religious, spiritual]
    2: concerned with or affecting the spirit or soul; "a spiritual
       approach to life"; "spiritual fulfillment"; "spiritual
       values"; "unearthly love" [syn: spiritual, unearthly]
    3: lacking material body or form or substance; "spiritual
       beings"; "the vital transcendental soul belonging to the
       spiritual realm"-Lewis Mumford
    4: resembling or characteristic of a phantom; "a ghostly face at
       the window"; "a phantasmal presence in the room"; "spectral
       emanations"; "spiritual tappings at a seance" [syn:
       apparitional, ghostlike, ghostly, phantasmal,
       spectral, spiritual]
    n 1: a kind of religious song originated by Blacks in the
         southern United States [syn: spiritual, Negro
         spiritual]