WordNet (r) 3.0 (2006):

multimedia
    n 1: transmission that combine media of communication (text and
         graphics and sound etc.) [syn: multimedia, multimedia
         system]

The Free On-line Dictionary of Computing (30 December 2018):

multimedia
Multimedia PC
multimedia system

    Any collection of data including text,
   graphics, images, audio and video, or any system for
   processing or interacting with such data.  Often also includes
   concepts from hypertext.

   This term was once almost synonymous with CD-ROM in the
   personal computer world because the large amounts of data
   involved were best supplied on CD-ROM.  DVDs and broadband
   Internet connections have now largely replaced CDs as the
   means of delivery.

   A "multimedia PC" typically includes software for playing DVD
   video, 5.1 audio hardware and can display video on a
   television.  It may also include a television receiver and
   software to record broadcast television to disk and play it
   back.  The Multimedia Personal Computer (MPC) standard was
   an attempt to improve compatibility between such systems.

   Usenet newsgroup: news:comp.multimedia.

   (1994-12-02)