Webster's English Dictionary

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meridian

Cross references:
  1. summit                
 
me.rid.i.an \m*-'rid-e--*n\ n [ME, fr. MF meridien, fr. meridien of noon, 
   fr. L meridianus,] fr. meridies noon, south, irreg. fr. medius mid + dies 
   day - more at MID, DEITY obs  1: the hour of noon : MIDDAY  2: a great 
   circle of the celestial sphere passing through its poles and the  zenith of 
   a given place 3: a high point  4a1: a great circle on the surface of the 
   earth passing through the poles a nd any given place 4a2: the half of such 
   a circle included between the poles  4b: a representation of such a circle 
   or half circle numbered for longitude  on a map or globe - meridian aj