Noun

(en noun)

The point of interconnection between entities.

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

(chemistry, physics) 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 surface of a lake is a water-air interface .

(computing) The point of interconnection between systems or subsystems.

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

(computing) The connection between a user and a machine.

The options are selected via the user interface .

(computing, object-oriented) The connection between parts of software.

This interface is implemented by several Java classes.

(computing, object-oriented) In object-oriented programming, a piece of code defining a set of operations that other code must implement.

The Audio and Video classes both implement the IPlayable interface .

Noun

(en noun)

The overside or up-side of a flat object such as a table, or of a liquid.

*{{quote-book, year=1963, author=(Margery Allingham), title=(The China Governess)

, chapter=Foreword citation , passage=A very neat old woman, still in her good outdoor coat and best beehive hat, was sitting at a polished mahogany table on whose surface there were several scored scratches so deep that a triangular piece of the veneer had come cleanly away,

The outside hull of a tangible object.

*{{quote-magazine, date=2013-05-11, volume=407, issue=8835, page=80, magazine=(The Economist)

, title= The climate of Tibet: Pole-land , passage=Of all the transitions brought about on the Earth’s surface by temperature change, the melting of ice into water is the starkest. It is binary. And for the land beneath, the air above and the life around, it changes everything.}}

*{{quote-magazine, date=2013-07-20, volume=408, issue=8845, magazine=(The Economist)

, title= Welcome to the plastisphere , passage=[The researchers] noticed many of their pieces of [plastic marine] debris sported surface pits around two microns across.}}

(lb) Outward or external appearance.

:

*(Vicesimus Knox) (1752-1821)

*:Vain and weak understandings, which penetrate no deeper than the surface .

*

*:“A tight little craft,” was Austin’s invariable comment on the matron; and she looked it, always trim and trig and smooth of surface like a converted yacht cleared for action. ¶ Near her wandered her husband, orientally bland, invariably affable,.

The locus of an equation (especially one with exactly two degrees of freedom) in a more-than-two-dimensional space.

(lb) That part of the side which is terminated by the flank prolonged, and the angle of the nearest bastion.

:(Stocqueler)