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]