interface

1. (chemistry, physics) A thin layer or boundary between different substances or two phases of a single substance.Examples: "If water and oil are mixed together, they tend to separate, and at equilibrium they are in different strata with an oil-water interface in between."; "The surface of a lake is a water-air interface."

2. (computing) The point of interconnection between systems or subsystems.Examples: "The data is sent over the air interface to the remote system."

3. (computing) The connection between a user and a machine.Examples: "The options are selected via the user interface."

4. (object-oriented programming) The connection between parts of software; also the public or published sections of an object or module.Examples: "This interface is implemented by several Java classes."; "Traits are somewhat between an interface and a mixin, as an interface contains only method signatures, while a trait includes also the full method definitions; on the other side mixins include method definitions, but they can also carry state through attributes, while traits usually don't."

5. (object-oriented programming) In object-oriented programming, a piece of code defining a set of operations that other code must implement.Examples: "The Audio and Video classes both implement the IPlayable interface."

6. (object-oriented programming) In some languages, a block of code declaring the interface (point of interconnection) between a class and code that interacts with it.