from The American Heritage® Dictionary of the English Language, 4th Edition
- n. The angle formed by a reflected ray and a perpendicular to the surface at the point of reflection.
from Wiktionary, Creative Commons Attribution/Share-Alike License
- n. The angle between the perpendicular and a ray reflected from a surface
from the GNU version of the Collaborative International Dictionary of English
- n. the angle which anything, as a ray of light, on leaving a reflecting surface, makes with the perpendicular to the surface.
from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.
- n. the angle between a reflected ray and a line perpendicular to the reflecting surface at the point of incidence
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