Webster's English Dictionary

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metropolis

me.trop.o.lis \m*-'tra:p-(*-)l*s\ n [LL, fr. Gk me-tropolis, fr. me-tr-, 
   me-te-r moth]er + polis city - more at MOTHER, POLICE 1: the mother city or 
   state of a colony esp. in ancient Greece  2: the chief or capital city of a 
   country, state, or region  3: a principal seat or center of an activity