The Collaborative International Dictionary of English v.0.48:

audiovisual \audiovisual\ audio-visual \audio-visual\adj.
   1. 1 pertaining to or using audiovisual aids in teaching or
      exposition the school's audiovisual department
      [WordNet 1.5]

The Collaborative International Dictionary of English v.0.48:

audiovisual \audiovisual\ n.
   1. 1 materials using sight or sound to present information;
      -- usually used in the plural. "language tapes and
      videocassettes and other audiovisuals"

   Syn: audiovisual aid.
        [WordNet 1.5]

WordNet (r) 3.0 (2006):

audiovisual
    adj 1: involving both hearing and seeing (usually relating to
           teaching aids); "the school's audiovisual department"
    n 1: materials using sight or sound to present information;
         "language tapes and videocassettes and other audiovisuals"
         [syn: audiovisual, audiovisual aid]