The point of interconnection or contact between entities.

“Public relations firms often serve as the interface between a company and the press.”

A thin layer or boundary between different substances or two phases of a single substance.

“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 point of interconnection between systems or subsystems.

“The data is sent over the air interface to the remote system.”

To construct an interface for.

To connect through an interface.

To serve as an interface.