How to sign: (chemistry) a surface forming a common boundary between two things (two objects or liquids or chemical phases)
Categories: surface
Within this category: oil-water interface
How to sign: (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
Similiar / Same: user interface
Categories: computer program, computer programme, program, programme
Within this category: command line interface, graphical user interface