- A surface forming a common boundary between adjacent regions, bodies, substances, or phases.
- A point at which independent systems or diverse groups interact: "the interface between crime and politics where much of our reality is to be found” ( Jack Kroll).
- Computer Science The point of interaction or communication between a computer and any other entity, such as a printer or human operator.
- Computer Science The layout of an application's graphic or textual controls in conjunction with the way the application responds to user activity: an interface whose icons were hard to remember.
- To join by means of an interface.
- To serve as an interface for.
- To serve as an interface or become interfaced.
- To interact or coordinate smoothly: "Theatergoers were lured out of their seats and interfaced with the scenery” ( New York Times).