A negative produced by exposing a high-resolution photographic plate, without camera or lens, near a subject illuminated by monochromatic, coherent radiation, as from a laser: when it is placed in a beam of coherent light a true three-dimensional image of the subject is formed.
(Definition from http://dictionary.reference.com/browse/hologram)
http://www.wikihow.com/Make-a-Hologram
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