shading

(noun) graded markings that indicate light or shaded areas in a drawing or painting.

(noun) a gradation involving small or imperceptible differences between grades. Synonyms: blending.

(verb) cast a shadow over. Synonyms: shadow, shade, shade off.

(verb) represent the effect of shade or shadow on. Synonyms: shade, fill in.

(verb) protect from light, heat, or view. Synonyms: shade. Example: "Shade your eyes when you step out into the bright sunlight."

(verb) vary slightly. Synonyms: shade. Example: "Shade the meaning."

(verb) pass from one quality such as color to another by a slight degree. Synonyms: shade. Example: "The butterfly wings shade to yellow."