Definitions for audiovisual aid
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Princeton's WordNet
audiovisual, audiovisual aid(noun)
materials using sight or sound to present information
"language tapes and videocassettes and other audiovisuals"
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"audiovisual aid." Definitions.net. STANDS4 LLC, 2013. Web. 23 May 2013. <http://www.definitions.net/definition/audiovisual aid>.

