Plural of medium; substances or materials through which something travels, or people claimed to communicate with spirits.
From Latin 'medius' meaning middle. The word literally refers to something in the middle—a middle ground or the means through which something passes.
The plural can be both 'mediums' (for people who claim to talk to ghosts or different sizes of coffee) and 'media' (for types of communication)—English can't decide which Latin plural rule to follow!
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