Diffraction is defined as a process by which light waves break up into dark and light bands or into the colors of the spectrum.
Light passing through a narrow opening in the blinds, causing bright and dark shadows and patterns to fall across the floor is an example of defraction.
diffraction definition by Webster's New World
the breaking up of a ray of light into dark and light bands or into the colors of the spectrum, caused by the interference of one part of a beam with another, as when the ray is deflected at the edge of an opaque object or passes through a narrow slit
a similar breaking up of other waves, as of sound or electricity
Origin: Midieval Latin diffractio ; from Classical Latin diffractus: see diffract
The process by which the propagation of radiant waveforms or light waves is modified as those waves encounter an obstacle or discontinuity, or exit one medium and enter another. Some of the waves deviate from their paths, i.e., bend, by diffraction. See also knife-edge diffraction, reflection, and refraction.
The bending of electromagnetic waves as they pass around corners or through holes smaller than the wavelengths of the waves themselves. See diffraction grating and refraction.
The breaking up of an incoming wave by some sort of geometrical structure — for example, a series of slits — followed by reconstruction of the wave by interference. Diffraction of light is characterized by alternate bands of light and dark or bands of different colors.