#1 medium n. a means or instrumentality for storing or communicating information. wn
#2 medium n. the surrounding environment; "fish require an aqueous medium". wn
#3 medium n. an intervening substance through which signals can travel as a means for communication. wn
#4 medium n. [culture medium] (bacteriology) a nutrient substance (solid or liquid) that is used to cultivate micro-organisms. wn
#5 medium s. (meat) cooked until there is just a little pink meat inside. wn
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