The Collaborative International Dictionary of English v.0.48:

Particular \Par*tic"u*lar\, n.
   1. A separate or distinct member of a class, or part of a
      whole; an individual fact, point, circumstance, detail, or
      item, which may be considered separately; as, the
      particulars of a story.
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            Particulars which it is not lawful for me to reveal.
                                                  --Bacon.
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            It is the greatest interest of particulars to
            advance the good of the community.    --L'Estrange.
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   2. Special or personal peculiarity, trait, or character;
      individuality; interest, etc. [Obs.]
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            For his particular I'll receive him gladly. --Shak.
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            If the particulars of each person be considered.
                                                  --Milton.
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            Temporal blessings, whether such as concern the
            public . . . or such as concern our particular.
                                                  --Whole Duty
                                                  of Man.
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   3. (Law) One of the details or items of grounds of claim; --
      usually in the pl.; also, a bill of particulars; a minute
      account; as, a particular of premises.
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            The reader has a particular of the books wherein
            this law was written.                 --Ayliffe.
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   Bill of particulars. See under Bill.

   In particular, specially; specifically; peculiarly;
      particularly; especially. "This, in particular, happens to
      the lungs." --Blackmore.

   To go into particulars, to relate or describe in detail or
      minutely.
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WordNet (r) 3.0 (2006):

in particular
    adv 1: specifically or especially distinguished from others;
           "loves Bach, particularly his partitas"; "recommended one
           book in particular"; "trace major population movements
           for the Pueblo groups in particular" [syn:
           particularly, in particular]

Moby Thesaurus II by Grady Ward, 1.0:

23 Moby Thesaurus words for "in particular":
   at length, completely, concretely, definitely, distinctly,
   especially, exactly, expressly, fully, in detail, in extenso,
   in full, in toto, item by item, minutely, particularly, precisely,
   separately, singly, specially, specifically, to be specific,
   wholly