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Wiktionary
mass medium

n. Any means of public communication that reaches a large audience

WordNet
mass medium

n. transmissions that are disseminated widely to the public [syn: medium]

Usage examples of "mass medium".

This indicates an ossified mode of thinking about the most dynamic mass medium ever created, the only interactive mass medium yet.

I am an exception to this, because I have mine via the printed word, the oldest mass medium on the planet, and this website is maintained by a publishing company that belongs to an even larger corporation owned in turn by shapeshifting reptiles from Beta Reticuli, but the rest of you, today, are free to mass-mediate your own personae.