Webster's English Dictionary

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preclude

Cross references:
  1. prevent               
 
pre.clude \pri-'klu:d\ \-'klu:-zh*n\ \-'klu:-siv, -ziv\ vt [L praecludere, 
   fr. prae- + claudere to close - more at ]CLOSE archaic  1: CLOSE  2: to 
   make impossible by necessary consequence  - pre.clu.sion n