Medium may mean:
- Recording medium, a physical material that holds information expressed in any of the existing recording formats
- Medium (spirituality), a person who claims to serve as an intermediary between the living and the dead
- Medium of instruction, the language used to educate in
- Average, the sum of all the members of the set divided by the number of items in the set
In science:
- Medium (optics), material through which waves propagate
- Processing medium, in industrial engineering, a material that plays a role in manufacturing processes
- Transmission medium, in physics, any material substance which can propagate waves or energy
- Growth medium, in biotechnology, an object in which microorganisms or cells in 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
- Excitable medium, a nonlinear dynamical system which has the capacity to propagate a wave
- Solvent in chemistry
In fiction:
- Medium (TV series), a 2005–2006 television series about a research medium for a district attorney's office
- The Medium, an opera by Gian-Carlo Menotti
See also
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