DuckCorp Dico

Found one definition

1.                 From The Collaborative International Dictionary of English v.0.48:
                   
   
   
                   
                     
   17 \17\ adj.
      1. denoting a quantity consisting of one more than sixteen
         and one less than eighteen; -- representing the number
         seventeen as Arabic numerals
      Syn: seventeen, xvii
           [WordNet 1.5 +PJC]