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back projection
back pro·jec·tion


noun 
Definition:
 
projecting film as background: the cinematic technique of projecting a film onto a translucent screen from behind, usually to provide a moving background against which other action can be filmed
Encarta® World English Dictionary [North American Edition] © & (P)2009 Microsoft Corporation. All rights reserved. Developed for Microsoft by Bloomsbury Publishing Plc.
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