interface

(noun) (chemistry) a surface forming a common boundary between two things (two objects or liquids or chemical phases).

(noun) (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. Synonyms: user interface.

(noun) the overlap where two theories or phenomena affect each other or have links with each other. Example: "The interface between chemistry and biology."

(noun) (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). Synonyms: port.