shading >> ˈʃeɪdɪŋ
Definition: [noun] the darkening or colouring of an illustration or diagram with parallel lines or a block of colour.
Example: scenes can be given perspective by colour and shading
Definition: [noun] a very slight variation.
Example: the shadings of opinion even among those who are in broad agreement
Definition: [noun] a layer of paint or material used to provide shade, especially for plants.
Example: liquid greenhouse shading