The Collaborative International Dictionary of English v.0.48:

Delicatessen \Del`i*ca*tes"sen\, n. pl. [G., fr. F.
   d['e]licatesse.]
   1. Relishes for the table; dainties; delicacies. "A dealer in
      delicatessen". --G. H. Putnam.
      [Webster 1913 Suppl.]

   2. ready-to-eat foods, such as cold cuts, cooked meats, and
      prepared salads.
      [PJC]

   3. sing.; pl. delicatessens. a store or section of a store
      where delicatessen[2] is sold. "Get a sandwich for lunch
      at the delicatessen counter."
      [PJC]

WordNet (r) 3.0 (2006):

delicatessen
    n 1: ready-to-eat food products [syn: delicatessen,
         delicatessen food]
    2: a shop selling ready-to-eat food products [syn:
       delicatessen, deli, food shop]