Webster's English Dictionary

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zenith

Cross references:
  1. summit                
 
ze.nith \'ze--n*th, esp Brit 'zen-ith\ n [ME senith, fr. MF cenith, fr. ML, 
   fr. OSp zenit, modif. of A]r samt (ar-ra's) way (of the head) 1: the point 
   of the celestial sphere that is directly opposite the nadir an d vertically 
   above the observer 2: the highest point reached in the heavens by a 
   celestial body  3: culminating point : ACME