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.
      [1913 Webster]

            It is sown a natural body, it is raised a spiritual
            body.                                 --1 Cor. xv.
                                                  44.
      [1913 Webster]

   2. Of or pertaining to the intellectual and higher endowments
      of the mind; mental; intellectual.
      [1913 Webster]

   3. Of or pertaining to the moral feelings or states of the
      soul, as distinguished from the external actions; reaching
      and affecting the spirits.
      [1913 Webster]

            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.
      [1913 Webster]

   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.
      [1913 Webster]

            That I may impart unto you some spiritual gift.
                                                  --Rom. i. ll.
      [1913 Webster]

            Blessed be the God and Father of our Lord Jesus
            Christ, who hath blessed us with all spiritual
            blessings.                            --Eph. i. 3.
      [1913 Webster]

            If a man be overtaken in a fault, ye which are
            spiritual, restore such an one.       --Gal. vi. 1.
      [1913 Webster]

   5. Not lay or temporal; relating to sacred things;
      ecclesiastical; as, the spiritual functions of the clergy;
      lords spiritual and temporal; a spiritual corporation.
      [1913 Webster]

   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.
      [1913 Webster]

The Collaborative International Dictionary of English v.0.48:

Spiritual \Spir"it*u*al\, n.
   A spiritual function, office, or affair. See Spirituality,
   2.
   [1913 Webster]

         He assigns supremacy to the pope in spirituals, and to
         the emperor in temporals.                --Lowell.
   [1913 Webster]

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]

Moby Thesaurus II by Grady Ward, 1.0:

183 Moby Thesaurus words for "spiritual":
   Christlike, Christly, God-fearing, Negro spiritual, affective,
   airy, angelic, anthem, arcane, asomatous, astral, automatist,
   awesome, awful, bodiless, cantata, canticle, cerebral,
   characteristic, chorale, church, church music, churchly,
   clairaudient, clairsentient, clairvoyant, clerical, conceptive,
   conceptual, constitutional, decarnate, decarnated, devotional,
   discarnate, disembodied, dispositional, divine, doxology,
   ecclesiastical, ectoplasmic, eerie, elevated, emotional,
   endopsychic, esoteric, ethereal, etheric, extramundane,
   extrasensory, extraterrestrial, fey, ghostish, ghostlike, ghostly,
   ghosty, godlike, godly, godly-minded, good, gospel, gospel music,
   heady, heavenly, high, high-minded, holy, holy-minded, hymn,
   hymn-tune, hymnody, hymnology, hypernormal, hyperphysical,
   immaterial, impalpable, imponderable, incorporate, incorporeal,
   ineffable, inenarrable, inexpressible, innate, inner,
   insubstantial, intangible, intellectual, intelligent, internal,
   introit, inviolable, inviolate, lofty, mass, mediumistic, mental,
   metaphysical, motet, mysterious, noetic, nonmaterial, nonphysical,
   noological, numinous, occult, offertory, offertory sentence,
   oratorio, otherworldly, paean, passion, phantasmal, phantasmic,
   phantom, phantomic, phantomlike, phrenic, preterhuman,
   preternatural, preternormal, pretersensual, priestly, prosodion,
   psalm, psalmody, psychic, psychical, psychokinetic, psychologic,
   psychological, psychosensory, pure, pure in heart, purehearted,
   rational, reasoning, recessional, religious, requiem, requiem mass,
   righteous, sacerdotal, sacred, sacred music, sacrosanct, saintlike,
   saintly, second-sighted, seraphic, shadowy, specterlike, spectral,
   spiritual-minded, spiritualistic, subjective, superhuman,
   supernatural, supernormal, superphysical, supersensible,
   supersensual, supramundane, supranatural, telekinetic, telepathic,
   temperamental, thinking, transcendental, transmundane, unearthly,
   unembodied, unextended, unfleshly, unhuman, unphysical,
   unspeakable, unsubstantial, untouchable, unutterable, unworldly,
   venerable, white spiritual, wraithlike, wraithy