What is the meaning of interface?

noun

• Chemistry) a surface forming a common boundary between two things (two objects or liquids or chemical phases. ()
• 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
• The overlap where two theories or phenomena affect each other or have links with each other.
  • usage: "the interface between chemistry and biology"
• 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