shading (Noun) — Graded markings that indicate light or shaded areas in a drawing or painting.
shading (Noun) — A gradation involving small or imperceptible differences between grades.
shading (Verb) — Cast a shadow over.
shading (Verb) — (art) represent the effect of shade or shadow on.
shading (Verb) — Protect from light, heat, or view. ex. "Shade your eyes when you step out into the bright sunlight"
shading (Verb) — Vary slightly. ex. "shade the meaning"
shading (Verb) — Pass from one quality such as colour to another by a slight degree. ex. "the butterfly wings shade to yellow"