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1882 (n.), 1967 (v.), from inter- + face. Related: Interfaced; interfacing.
interface in·ter·face (ĭn'tər-fās')n. A surface forming a common boundary between adjacent regions or bodies.
The point of interaction or communication between a computer and any other entity, such as a printer or human operator.
The layout of an application's graphic or textual controls in conjunction with the way the application responds to user activity. See more at GUI.