medium

a means or instrumentality for storing or communicating information

the surrounding environment

• “fish require an aqueous medium”

an intervening substance through which signals can travel as a means for communication

(bacteriology) a nutrient substance (solid or liquid) that is used to cultivate micro-organisms

an intervening substance through which something is achieved

• “the dissolving medium is called a solvent”

a liquid with which pigment is mixed by a painter

(biology) a substance in which specimens are preserved or displayed

a state that is intermediate between extremes; a middle position

• “a happy medium”

someone who serves as an intermediary between the living and the dead

• “he consulted several mediums”

transmissions that are disseminated widely to the public

an occupation for which you are especially well suited

• “in law he found his true metier”

around the middle of a scale of evaluation of physical measures

• “an orange of average size”
• “intermediate capacity”
• “a plane with intermediate range”
• “medium bombers”

(of meat) cooked until there is just a little pink meat inside