the act of exposing the same film, frame, plate, etc., twice.
the picture resulting from such exposure.
Origin of double exposure
First recorded in 1890–95
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2019
the act or process of recording two superimposed images on a photographic medium, usually done intentionally to produce a special effect
the photograph resulting from such an act
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012