definition of
medium

[1] #1 medium n. a means or instrumentality for storing or communicating information. wn

[2] #2 medium n. the surrounding environment; "fish require an aqueous medium". wn

[3] #3 medium n. an intervening substance through which signals can travel as a means for communication. wn

[4] #4 medium n. [culture medium] (bacteriology) a nutrient substance (solid or liquid) that is used to cultivate micro-organisms. wn

[5] #5 medium s. (meat) cooked until there is just a little pink meat inside. wn