medium (Noun) — A means or instrumentality for storing or communicating information.
medium (Noun) — The surrounding environment. ex. "fish require an aqueous medium"
medium (Noun) — An intervening substance through which signals can travel as a means for communication.
medium (Noun) — (bacteriology) a nutrient substance (solid or liquid) that is used to cultivate micro-organisms.
medium (Noun) — A liquid with which pigment is mixed by a painter.
medium (Noun) — (biology) a substance in which specimens are preserved or displayed.
medium (Noun) — An intervening substance through which something is achieved. ex. "the dissolving medium is called a solvent"
medium (Noun) — A state that is intermediate between extremes; a middle position. ex. "a happy medium"
medium (Noun) — Someone who serves as an intermediary between the living and the dead.
medium (Noun) — (usually plural) transmissions that are disseminated widely to the public.
medium (Noun) — An occupation for which you are especially well suited. ex. "in law he found his true medium"
medium (Adjective) — Around the middle of a scale of evaluation. ex. "medium bombers"
medium (Adjective) — (meat) cooked until there is just a little pink meat inside.