The Collaborative International Dictionary of English v.0.48:

Particularize \Par*tic"u*lar*ize\, v. t. [imp. & p. p.
   Particularized; p. pr. & vb. n. Particularizing.] [Cf. F.
   particulariser.]
   To give as a particular, or as the particulars; to mention
   particularly; to give the particulars of; to enumerate or
   specify in detail. [Also spelled particularise.]
   [1913 Webster]

         He not only boasts of his parentage as an Israelite,
         but particularizes his descent from Benjamin.
                                                  --Atterbury.
   [1913 Webster]

The Collaborative International Dictionary of English v.0.48:

Particularize \Par*tic"u*lar*ize\, v. i.
   To mention or attend to particulars; to give minute details;
   to be circumstantial; as, to particularize in a narrative.
   [1913 Webster]

WordNet (r) 3.0 (2006):

particularize
    v 1: be specific about; "Could you please specify your criticism
         of my paper?" [syn: specify, particularize,
         particularise, specialize, specialise] [ant:
         generalise, generalize]

Moby Thesaurus II by Grady Ward, 1.0:

77 Moby Thesaurus words for "particularize":
   adduce, amplify, analyze, anatomize, atomize, be precise,
   call to mind, change, chop logic, circumstantiate, cite,
   cite a particular, demonstrate, descant, descend to particulars,
   desynonymize, detail, develop, difference, differentiate, dilate,
   discriminate, disequalize, disjoin, distinguish, diversify, divide,
   document, elaborate, enlarge, enlarge upon, enter into detail,
   enumerate, evolve, example, exemplify, expand, expatiate,
   explicate, give a for-instance, give full particulars, illustrate,
   individualize, individuate, instance, inventory, itemize, list,
   make a distinction, make precise, mark, mark off, mark out, modify,
   name, peculiarize, personalize, precise, quote,
   refine a distinction, rehearse in extenso, relate at large,
   segregate, separate, set apart, set off, sever, severalize,
   specialize, specify, spell out, split hairs, stipulate,
   substantiate, unfold, vary, work out