(of a missile) fired from an aircraft at a target on land or water

(of a missile) fired from the ground, or from a ship, at an aircraft in flight, or at an incoming missile

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

capable of lowering the surface tension of a liquid

(optics) A surface to which rays reflected or refracted by another surface are tangents.

A numerical description of the flatness or roughness of a surface, especially an optical or machined surface.

Overland flow of excess water (with or without accumulated contaminants) that cannot be absorbed by the ground as infiltration.

(geometry) A surface (in more than two dimensions, a plane is trivially developable) that can be flattened into a plane without distortion.

(mathematics) A one-dimensional complex manifold; a generalization of the complex plane.

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