DuckCorp Dico

Found one definition

1.                 From WordNet (r) 3.0 (2006):
                   
   
   
                   
                     
   EST
       n 1: standard time in the 5th time zone west of Greenwich,
            reckoned at the 75th meridian; used in the eastern United
            States [syn: Eastern Time, Eastern Standard Time,
            EST]