(idiomatic) To barely begin; to see or do only a fraction of what is possible.

Alternative spelling of subsurface

(engineering) Unwanted radar or sonar wave reflection arising from the land or sea surface.

(geometry) The total area on the surface of an object. / (computing) The total resources of a system that are accessible from the outside world and thus might be attacked.

plural of surface area

(physics) A quantized electromagnetic wave trapped at a metallic surface through interaction with the free electrons of the metal.

(differential geometry) A unit vector at any given point P of a surface M which is perpendicular to the tangent plane T_P(M) of M at P. For a surface with parametrization ⃑x(u,v), it is given by

(mathematics) A surface formed when a given curve is revolved around a given axis. If the resulting surface is a closed one, it also defines a solid of revolution.

(aeronautics) A moveable surface attached to a machine such as an aircraft or submarine that can be used to control the machine's motion in roll, pitch or yaw.

plural of control surface