Webster's English Dictionary

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apex

Cross references:
  1. summit                
 
apex \'a--.peks\ \'a--p*-.se-z, 'ap-*-\ n or apex.es or api.ces [L] pl  1a: 
   the uppermost point : VERTEX  1b: the narrowed or pointed end : TIP  2: the 
   highest or culminating point