Source : Webster's Revised Unabridged Dictionary (1913)

Sizable \Siz"a*ble\, a.
   1. Of considerable size or bulk. ``A sizable volume.'' --Bp.
      Hurd.

   2. Being of reasonable or suitable size; as, sizable timber;
      sizable bulk. --Arbuthnot.

Source : WordNet®

sizable
     adj 1: fairly large; "a sizable fortune"; "an ample waistline"; "of
            ample proportions" [syn: {ample}, {sizeable}]
     2: large in amount or extent or degree; "it cost a considerable
        amount"; "a goodly amount"; "received a hefty bonus"; "a
        respectable sum"; "a tidy sum of money"; "a sizable
        fortune" [syn: {goodly}, {goodish}, {hefty}, {respectable},
         {sizeable}, {tidy}]