The Collaborative International Dictionary of English v.0.48:

Particularity \Par*tic`u*lar"i*ty\, n.; pl. Particularities.
   [Cf. F. particularit['e].]
   1. The state or quality of being particular; distinctiveness;
      circumstantiality; minuteness in detail.
      [1913 Webster]

   2. That which is particular; as:
      (a) Peculiar quality; individual characteristic;
          peculiarity. "An old heathen altar with this
          particularity." --Addison.
      (b) Special circumstance; minute detail; particular. "Even
          descending to particularities." --Sir P. Sidney.
      (c) Something of special or private concern or interest.
          [1913 Webster]

                Let the general trumpet blow his blast,
                Particularities and petty sounds
                To cease!                         --Shak.
          [1913 Webster]

WordNet (r) 3.0 (2006):

particularity
    n 1: the quality of being particular and pertaining to a
         specific case or instance; "the particularity of human
         situations" [syn: particularity, specialness] [ant:
         generality]

Moby Thesaurus II by Grady Ward, 1.0:

131 Moby Thesaurus words for "particularity":
   accuracy, aroma, attention to detail, attribute, badge, brand,
   cachet, cast, censoriousness, character, characteristic,
   choosiness, circumstantiality, combination, configuration,
   conscientiousness, correctness, criticality, criticalness, cut,
   delicacy, detail, differentia, differential, discriminatingness,
   discrimination, discriminativeness, distinctive feature,
   distinctiveness, earmark, exactingness, exactitude, exactness,
   exquisiteness, fastidiousness, feature, figure, finicality,
   finicalness, finickiness, finickingness, flavor, fusion, fussiness,
   gust, hallmark, identity, idiocrasy, idiosyncrasy, impress,
   impression, index, individualism, individuality, indivisibility,
   intactness, integrality, integration, integrity, inviolability,
   irreducibility, keynote, lineaments, mannerism, mark, marking,
   meticulousness, minuteness, minuteness of detail, mold, nature,
   niceness, nicety, odor, oneness, organic unity, particularness,
   peculiarity, perfectionism, preciseness, precisianism, precision,
   priggishness, property, prudishness, punctilio, punctiliousness,
   punctuality, purism, puritanism, purity, quality, quirk,
   refinement, rigidness, rigor, rigorousness, savor, scrupulosity,
   scrupulousness, seal, selectiveness, selectivity, selfsameness,
   sensitivity, shape, simplicity, singleness, singularity, smack,
   solidarity, solidification, solidity, specialty, specificity,
   stamp, strictness, subtlety, taint, tang, taste, token, trait,
   trick, undividedness, unification, uniformity, uniqueness, unity,
   univocity, wholeness