From: mdhangton@gmail.com   
      
   What do you think is the difference between these in SF?   
      
   There is a website TV Tropes.  It has some science fictional stuff   
   listed in it, and a lot of people on internet cite it when they talk   
   about SF cliches.  I don't think the word "trope" is used correctly   
   there.  I don't think it appeared in the OED as a synonym for motif   
   until 2007.  Trope = motif doesn't appear in many dictionaries.  I   
   haven't seen trope = cliche in any dictionary.   
      
   --- SoupGate-Win32 v1.05   
    * Origin: you cannot sedate... all the things you hate (1:229/2)