Definition of "Medium" :
noun: an occupation for which you are especially well suited
noun: an intervening substance through which signals can travel as a means for communication
noun: a means or instrumentality for storing or communicating information
noun: (usually plural) transmissions that are disseminated widely to the public
noun: the surrounding environment
"Fish require an aqueous medium."
noun: someone who serves as an intermediary between the living and the dead
"He consulted several mediums."
noun: a state that is intermediate between extremes; a middle position
"A happy medium."
noun: an intervening substance through which something is achieved
"The dissolving medium is called a solvent."
noun: (bacteriology) a nutrient substance (solid or liquid) that is used to cultivate micro-organisms
noun: (biology) a substance in which specimens are preserved or displayed
noun: a liquid with which pigment is mixed by a painter
adjective: (meat) cooked until there is just a little pink meat inside
adjective: around the middle of a scale of evaluation