Great question. The plural of "medium" depends on how you're using the word.
In the sense of "a means of communication or expression" such as in "the TV medium" or "the written medium," the plural is "media." So you would say "the new media are changing the way we consume news."
However, if you're using "medium" to refer to a psychic or someone who communicates with the dead, the plural would be "mediums." So you would say "there were multiple mediums at the seance last night."
Hope that helps! Let me know if you have any more language-related questions.
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