Webster's English Dictionary

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symmetry

sym.me.try \'sim-*-tre-\ n [L symmetria, fr. Gk, fr. symmetros symmetrical, 
   fr. syn- + (Xmetron measure - more at MEASURE 1: balanced proportions; also 
   : beauty of form arising from balance d proportions 2: the property of 
   being symmetrical; esp : correspondence in size,  shape, and relative 
   position of parts on opposite sides of a dividing line or median plane or 
   about a center or axis