medium
noun
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
Synonymsculture mediuma liquid with which pigment is mixed by a painter
(biology) a substance in which specimens are preserved or displayed
an intervening substance through which something is achieved
“the dissolving medium is called a solvent”
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”
(usually plural) transmissions that are disseminated widely to the public
Synonymsmass mediuman occupation for which you are especially well suited
“in law he found his true metier”
Synonymsmetier
adjective
around the middle of a scale of evaluation
“an orange of average size”
“intermediate capacity”
(meat) cooked until there is just a little pink meat inside
Source: WordNet 3.1, Princeton University