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.
Definition of anterior. 1  1a : situated before or toward the front an anterior ligamentb : situated near or toward the head or part most nearly corresponding to a head. 2  2 : coming before in time or development labor problems anterior to the strike.