ETYM Latin reflexio: cf. French réflexion. Related to Riflect.
1. The ability to reflect beams or rays; SYN. reflexion, reflectivity.
2. The image of something as reflected by a mirror (or other reflective material).
3. The phenomenon of a propagating wave (light or sound) being thrown back from a surface; SYN. reflexion.
The throwing back or deflection of waves, such as light or sound waves, when they hit a surface. The law of reflection states that the angle of incidence (the angle between the ray and a perpendicular line drawn to the surface) is equal to the angle of reflection (the angle between the reflected ray and a perpendicular to the surface).
In geometry, a transformation that maps a shape across a line so that the line forms an axis of reflectional symmetry. Reflections in two perpendicular axes produce a rotation of 180ş (a half turn). Reflections can be used to deduce many properties of shapes.