plural medias
often attributive
1
a
singular or plural in construction : mass media
b
medias plural : members of the mass media (such as news outlets)
2
: a medium of cultivation, conveyance, or expression
Air is a media that conveys sound.
especially : medium sense 2a
The singular media and its plural medias seem to have originated in the field of advertising over 70 years ago; they are still so used without stigma in that specialized field. In most other applications media is used as a plural of medium. The popularity of the word in references to the agencies of mass communication is leading to the formation of a mass noun, construed as a singular.
there's no basis for it. You know, the news media gets on to something —
Edwin Meese 3d
the media is less interested in the party's policies —
James Lewis, Guardian Weekly
This use is not as well established as the mass-noun use of data and is likely to incur criticism especially in writing.
plural mediae ˈmē-dē-ˌē
1
[Late Latin, from Latin, feminine of medius; from the voiced stops' being regarded as intermediate between the tenues and the aspirates] : a voiced (see voiced sense 2) stop (see stop entry 2 sense 1b)
2
[New Latin, from Latin] : the middle coat of the wall of a blood or lymph (see lymph sense 2) vessel consisting chiefly of circular muscle fibers
media
3 of 3plural of medium
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Merriam-Webster unabridged



