Definitions of binary:

  • noun:   a system of two stars that revolve around each other under their mutual gravitation
  • adjective:   consisting of two (units or components or elements or terms) or based on two
    Example: "A binary star is a system in which two stars revolve around each other"
  • adjective:   of or pertaining to a number system have 2 as its base
    Example: "A binary digit"