Source : Webster's Revised Unabridged Dictionary (1913)

Department store \De*part"ment store\
   A store keeping a great variety of goods which are arranged
   in several departments, esp. one with dry goods as the
   principal stock.

Source : WordNet®

department store
     n : a large retail store organized into departments offering a
         variety of merchandise; commonly part of a retail chain
         [syn: {emporium}]