1 [mass noun] the darkening or colouring of an illustration or diagram with parallel lines or a block of colour:scenes can be given perspective by colour and shading
2a very slight variation:the shadings of opinion even among those who are in broad agreement
3 [mass noun] a layer of paint or material used to provide shade, especially for plants:liquid greenhouse shading
shading in other Oxford dictionaries
Definition of shading in the US English dictionary
