As coined in the writings of Marshall McLuhan, metamedia referred to new relationships between form and content in the development of new technologies and new media. Understanding Media : The Extensions of Man (1964) Marshall McLuhan REFERENCE NEEDED: The book Understanding Media doesn't once use the word metamedia, meta-media, meta-medium or metamedium. Development While hypermedia was coined a year later in 1965 by a programmer to refer to file systems of multimedia, the term metamedia was coined in 1964, referring to the theoretical effects of mass media. McLuhan, like his teacher Harold Innis, an earlier theorist of communication theory, saw communication as central to social systems. More recent distinctions between old and new media have meant that metamedia becomes used to describe modernity and art more than systems.
As coined by Alan Kay and Elena Goldberg, metamedia refers to new relationships between form and content in the development of new technologies and new media. Personal Dynamic Media (1977) Development 
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in the writings of Marshall McLuhan, metamedia referred
by Alan Kay and Elena Goldberg, metamedia refers
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Understanding Media : The Extensions of Man (1964) Marshall McLuhan
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REFERENCE NEEDED: The book Understanding Media doesn't once use the word metamedia, meta-media, meta-medium or metamedium.
Personal Dynamic Media (1977)
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While hypermedia was coined a year later in 1965 by a programmer to refer to file systems of multimedia, the term metamedia was coined in 1964, referring to the theoretical effects of mass media. McLuhan, like his teacher Harold Innis, an earlier theorist of communication theory, saw communication as central to social systems.
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More recent distinctions between old and new media have meant that metamedia becomes used to describe modernity and art more than systems.