n (context|plural 'media' or 'mediums') The nature of the surrounding environment, e.g. solid, liquid, gas, vacuum, or a specific substance such as a solvent.
n (context|plural 'media' or 'mediums') The material or empty space through which signals, waves or forces pass.
n (context|plural 'media' or 'mediums'|engineering) The materials used to finish a workpiece using a mass finishing or abrasive blasting process.
n (context|plural 'media' or 'mediums'|microbiology) A nutrient solution for the growth of cells in vitro.
n (context|plural 'mediums'|spiritualism) Someone who supposedly conveys information from the spirit world.
n (context|plural 'mediums') Anything having a measurement intermediate between extremes, such as a garment or container.
n (context|plural 'mediums'|Ireland|dated|informal) A half pint serve of Guinness (or other stout in some regions).
a Of meat, cooked to a point greater than rare but less than well done; typically, so the meat is still red in the centre.