1. (chemistry) a surface forming a common boundary between two things (two objects, liquids or chemical phases)
   "The scientists studied the interface between the oil and water layers"
    
2. (computing) a program that controls a display for the user (usually on a computer monitor) and that allows the user to interact with the system
   "The new app had an intuitive user interface";
   - user interface, UI
    
3. The overlap where two theories or phenomena affect each other or have links with each other
   "the interface between chemistry and biology"
    
4. (computing) 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)
   "He connected the printer to the USB interface on his laptop";
   - port

1. (computing) to connect with an interface
   "The new software was designed to interface seamlessly with existing systems"
    
2. Interact
   "I think you should try to interface with sales department"

Derived forms: interfacing, interfaces, interfaced

Type of: computer circuit, computer program, computer programme [Brit], convergence, intersection, overlap, program, programme [Brit, Cdn], surface

Encyclopedia: Interface, Journal of Applied Linguistics