medium in WordNet English dictionary

1. around the middle of a scale of evaluation
   "an orange of average size"; "intermediate capacity"; "medium bombers"
   average  intermediate  medium 
   
2. (meat) cooked until there is just a little pink meat inside
   medium 
   

1. (bacteriology) a nutrient substance (solid or liquid) that is used to cultivate micro-organisms
   culture medium  medium 
   
2. (usually plural) transmissions that are disseminated widely to the public
   medium  mass medium 
   
3. an occupation for which you are especially well suited
   "in law he found his true metier"
   metier  medium 
   
4. an intervening substance through which signals can travel as a means for communication
   medium 
   
5. a means or instrumentality for storing or communicating information
   medium 
   
6. the surrounding environment
   "fish require an aqueous medium"
   medium 
   
7. someone who serves as an intermediary between the living and the dead
   "he consulted several mediums"
   medium  spiritualist  sensitive 
   
8. a state that is intermediate between extremes; a middle position
   "a happy medium"
   medium 
   
9. (biology) a substance in which specimens are preserved or displayed
   medium 
   
10. a liquid with which pigment is mixed by a painter
    medium 
    
11. an intervening substance through which something is achieved
    "the dissolving medium is called a solvent"
    medium