(usually used with a singular verb) a system in which various forms of information, as data, text, graphics, video, and audio, are linked together by a hypertext program.
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British Dictionary definitions for hypermedia
computer software and hardware that allows users to interact with text, graphics, sound, and video, each of which can be accessed from within any of the others: Compare hypertext
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012