Reflectance values express the percentage of light that is reflected back from a surface, the difference having been absorbed or transmitted by the surface.
Definition of AXIAL. 1. : of, relating to, or having the characteristics of an axis.
LINK / CITE ADD TO WORD LIST. noun. The definition of an axis is a real or imaginary line on which something rotates, or a straight line around which things are evenly arranged. 1  An example of axis is an imaginary line running through the earth on which the earth rotates.