Source : Webster's Revised Unabridged Dictionary (1913)

Binder \Bind"er\, n.
   1. One who binds; as, a binder of sheaves; one whose trade is
      to bind; as, a binder of books.

   2. Anything that binds, as a fillet, cord, rope, or band; a
      bandage; -- esp. the principal piece of timber intended to
      bind together any building.

Source : WordNet®

binder
     n 1: a machine that cuts grain and binds it in sheaves [syn: {reaper
          binder}]
     2: something used to bind separate particles together or
        facilitate adhesion to a surface
     3: holds loose papers or magazines [syn: {ring-binder}]
     4: something used to tie or bind [syn: {ligature}]