WordNet sense 1 ((bacteriology) a nutrient substance (solid or liquid) that is used to cultivate micro-organisms):

culture medium

WordNet sense 2 (someone who serves as an intermediary between the living and the dead):

sensitive, spiritualist

WordNet sense 3 ((usually plural) transmissions that are disseminated widely to the public):

mass medium

WordNet sense 4 (around the middle of a scale of evaluation of physical measures):

average, intermediate, intermediate

WordNet sense 5 (being within reasonable or average limits; not excessive or extreme):

moderate, moderate

WordNet sense 6 (having been prepared for eating by the application of heat):

cooked

WordNet sense 7 (an occupation for which you are especially well suited):

metier