The Collaborative International Dictionary of English v.0.48:

Till \Till\, n. [Properly, a drawer, from OE. tillen to draw.
   See Tiller the lever of a rudder.]
   A drawer. Specifically:
   (a) A tray or drawer in a chest.
   (b) A money drawer in a shop or store.
       [1913 Webster]

   Till alarm, a device for sounding an alarm when a money
      drawer is opened or tampered with.
      [1913 Webster]