a means of doing something; a vehicle
a channel or means of communication, esp one, e.g. television, designed to reach large numbers of people
a material or technical means of artistic expression
a substance regarded as the means of transmission of a force or effect
a disk, tape, etc on which the output of a computer can be stored
a liquid, e.g. oil or water, with which dry colouring material can be mixed
(pl mediums) a person through whom others seek to communicate with the spirits of the dead
a middle position or state
a surrounding or enveloping substance; esp a matrix (natural material in which a fossil, gem, etc is embedded)
a nutrient system for the artificial cultivation of cells or organisms, esp bacteria
a liquid or solid in which animal or plant structures are placed, e.g. for preservation