Webster's English Dictionary

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topology

to.pol.o.gy \-je-\ n [ISV] 1: topographical study of a particular place; 
   specif : the history  of a region as indicated by its topography 2: the 
   anatomy of a particular region of the body  3: a branch of mathematics that 
   investigates the properties of a geometric  configuration (as a point set) 
   that are unaltered if the configuration is subjected to a one-to-one 
   continuous transformation in both directions