Definitions for audiovisual aids
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Random House Webster's College Dictionary
au′diovis′ual aids′(n.pl.)
training or educational materials directed at the sense of hearing and the sense of sight, as films, recordings, and photographs, esp. as used in classroom instruction.
Origin of audiovisual aids:
1935–40
U.S. National Library of Medicine
Audiovisual Aids
Auditory and visual instructional materials.
Citation
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"audiovisual aids." Definitions.net. STANDS4 LLC, 2013. Web. 19 May 2013. <http://www.definitions.net/definition/audiovisual aids>.