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Medium may refer to:

Communication

Medium (communication), any tool used to store and deliver information or data

Data storage device, any physical material that records or holds recorded information

Art medium, materials and techniques used by artists to produce art works;

; Transmission medium, in physics and telecommunications, any material substance which can propagate waves or energy

Optical Medium, material through which electromagnetic waves propagate;

;

Economics

Medium of exchange, any monetary instrument used to pay for goods and/or services;

Television

Medium (TV series), an American drama TV series about a psychic working for the Phoenix District Attorney;

Education

Medium of instruction, any language or other tools used to educate, train, or instruct;

Measurement

A point or degree near the middle of a spectrum or range. For example: The medium degree of doneness in cooking meat; see: temperature (meat);

Natural Science

In general, a medium is a material that is either itself undergoing a process that is being studied or used (e.g. transmission medium), or enabling another process of interest (e.g. growth medium). Specific examples include the following:

Processing medium, in industrial engineering, a material that plays a role in manufacturing processes; Excitable medium, a nonlinear dynamic system which has the capacity to propagate a wave; Growth medium (or culture medium), in biotechnology, an object in which microorganisms or cells experience growth; Interplanetary medium, in astronomy, material which fills the solar system; Interstellar medium, in astronomy, the matter and energy content that exists between the stars within a galaxy;