Source : Webster's Revised Unabridged Dictionary (1913)

Besides \Be*sides\, prep.
   Over and above; separate or distinct from; in addition to;
   other than; else than. See {Beside}, prep., 3, and Syn. under
   {Beside}.

         Besides your cheer, you shall have sport. --Shak.

Besides \Be*sides"\, Beside \Be*side"\, adv. [OE. Same as
   beside, prep.; the ending -s is an adverbial one, prop. a
   genitive sign.]
   1. On one side. [Obs.] --Chaucer. Shak.

   2. More than that; over and above; not included in the
      number, or in what has been mentioned; moreover; in
      addition.

            The men said unto Lot, Hast thou here any besides ?
                                                  --Gen. xix.
                                                  12.

            To all beside, as much an empty shade, An Eugene
            living, as a C[ae]sar dead.           --Pope.

   Note: These sentences may be considered as elliptical.

Source : WordNet®

besides
     adv 1: making an additional point; anyway; "I don't want to go to a
            restaurant; besides, we can't afford it"; "she
            couldn't shelter behind him all the time and in any
            case he wasn't always with her" [syn: {in any case}]
     2: in addition; "he has a Mercedes, too" [syn: {too}, {also}, {likewise},
         {as well}]