DuckCorp Dico

Found one definition

1.                 From WordNet (r) 3.0 (2006):
                   
   
   
                   
                     
   lettered
       adj 1: highly educated; having extensive information or
              understanding; "knowing instructors"; "a knowledgeable
              critic"; "a knowledgeable audience" [syn: knowing,
              knowledgeable, learned, lettered, well-educated,
              well-read]