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(1)   (chemistry) a surface forming a common boundary between two things (two objects or liquids or chemical phases)
(2)   (computer science) computer circuit consisting of the hardware and associated circuitry that links one device with another (especially a computer and a hard disk drive or other peripherals)
(3)   The overlap where two theories or phenomena affect each other or have links with each other
"The interface between chemistry and biology"
(4)   (computer science) a program that controls a display for the user (usually on a computer monitor) and that allows the user to interact with the system


  1. The point of interconnection between two entities.
    Public relations firms often serve as the interface between a company and the press.
  2. The point of interconnection between two systems or subsystems.
    The data is sent over the air interface to the remote system.
  3. The connection between a user and a machine.
    The options are selected via the user interface.
  4. A thin layer or boundary between two different substances or two phases of a single substance.
    For example, if water and oil are mixed together, they tend to separate, and at equilibrium they are in two different strata with an oil-water interface in between.
    The surface of a lake is a water-air interface.
  5. In object-oriented programming, a piece of code defining a set of operations that other code must implement.


  1. to construct an interface for, to connect through an interface
  2. to be an interface, to be into an interface