Definitions of central:

• noun:   a workplace that serves as a telecommunications facility where lines from telephones can be connected together to permit communication
• adjective:   used in the description of a place that in the middle of another place

  Example: "The people of Central and Northern Europe"

• adjective:   in or near a center or constituting a center; the inner area

  Example: "A central position"

• adjective:   centrally located and easy to reach

  Example: "The central city has good bus service"

• adjective:   serving as an essential component

  Example: "The central cause of the problem"