What is the meaning of topology?

noun

• Topographic study of a given place (especially the history of the place as indicated by its topography. )
  • usage: "Greenland's topology has been shaped by the glaciers of the ice age"
• The study of anatomy based on regions or divisions of the body and emphasizing the relations between various structures (muscles and nerves and arteries etc.) in that region.
  • synonyms: regional anatomy, topographic anatomy
• The branch of pure mathematics that deals only with the properties of a figure X that hold for every figure into which X can be transformed with a one-to-one correspondence that is continuous in both directions.
  • synonyms: analysis situs
• The configuration of a communication network.
  • synonyms: network topology