Definitions from Wiktionary ( )

▸ noun:  The material of the surrounding environment, e.g. solid, liquid, gas, vacuum, or a specific substance such as a solvent.
▸ noun:  The materials or empty space through which signals, waves, or forces pass.
▸ noun:  A format for communicating or presenting information.
▸ noun:  (microbiology) A nutrient substance, commonly a solution or solid, for the growth of cells in vitro.
▸ noun:  (biology, horticulture etc.) A substance, structure, or environment in which living organisms subsist, grow or are cultured.
▸ noun:  A means, channel, agency or go-between through which communication, commerce, etc is conveyed or carried on, or by which an aim is achieved.
▸ noun:  (engineering) The materials used to finish a workpiece using a mass finishing or abrasive blasting process.
▸ noun:  (countable, plural mediums or media) A liquid base which carries pigment in paint.
▸ noun:  (painting) A means of expression, in the arts, such as a material (oil, pastel, clay, etc) or method or style (expressionism, jazz, etc).
▸ noun:  (countable, logic) The mean or middle term of a syllogism, that by which the extremes are brought into connection.
▸ noun:  (countable, spiritualism, plural mediums) Someone who supposedly conveys information from the spirit world.
▸ noun:  (countable) A middle place or degree.
▸ noun:  (countable, dated) An average; sometimes the mathematical mean.
▸ noun:  Anything of a middle rank or position.
▸ noun:  (uncountable, especially clothing, food or drink) One of several common sizes to which an item may be manufactured.
▸ noun:  (countable, especially clothing, food or drink) An item labelled or denoted as being that size.
▸ noun:  (countable, especially with respect to clothing) One who fits an item of that size.
▸ noun:  (countable, Ireland, dated, informal) A half-pint serving of Guinness (or other stout in some regions).
▸ adjective:  (obsolete) Arithmetically average.
▸ adjective:  Of intermediate size, degree, amount etc.
▸ adjective:  Of meat, cooked to a point greater than rare but less than well done; typically, so the meat is still red in the centre.
▸ adjective:  (especially clothing, food or drink) That is medium (the manufactured size).
▸ adverb:  To a medium extent.

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