Webster's English Dictionary

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stadium

sta.di.um \'sta-d-e--*m\ \-e--*\ n or sta.dia or sta.di.ums [ME, fr. L, fr. 
   Gk stadion, alter. of spadion, fr. span to pu] [NL, fr. L] pl ll - more at 
   SPAN 1a: any of various ancient Greek units of length ranging in value from 
   607  to 738 English feet 1b: an ancient Roman unit of length equal to 
   606.95 English feet  2a: a course for footraces in ancient Greece orig. one 
   stadium in length  2b: a tiered structure with seats for spectators 
   surrounding an ancient Gre ek running track pl usu stadiums  2c: a large 
   usu. unroofed building with tiers of seats for spectators at sp orts events 
   3: a stage in a life history; esp : one between successive molts