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

"Medium bombers."