General Science


  • noun a substance in which an organism lives or is grown


  • adjective referring to something that has a position or represents a condition midway between extremes
  • noun a substance through which something else is transmitted or carried


  • noun a way of doing something, means of doing something


  • Any material used for the transmission of signals (radio, light, and sound waves). A medium could be cable or wire (radio); optical fiber (light); or water, air, or free space (sound).
  • In paint, the liquid in which the other ingredients are suspended or dissolved.


  • The substance or entity through which something is transmitted, conveyed, carried, or the like. For example, a vacuum, a fluid, a plasma, or a solid.
  • A surrounding environment within which materials and entities exist, and within which phenomena, such as that of a physical or chemical nature, take place. For example, a vacuum, a fluid, a plasma, or a solid.
  • Any physical material or medium which serves to store or otherwise contain data. For instance, optical disks, magnetic tapes and disks, microfilm, and paper. Also called data medium, or storage medium.
  • Situated or occurring between two values or degrees. For instance, occurring at or near the middle of an interval.


  • adjective used for describing steak that is cooked so that it is brown on the outside but slightly pink and moist inside

Information & Library Science

  • adjective neither large nor small, but middle-sized
  • noun the means used to communicate or express oneself


  • noun one particular means of communicating information to the public

Media Studies

  • noun a means of mass communication, e.g. television, radio or newspapers
  • noun the physical means of transmitting a message through a channel of communication


  • adjective average, in the middle or at the halfway point


  • adjective cooked so that the meat is brown on the outside but slightly pink and moist inside

Origin & History of “medium”

Latin medius meant ‘middle’ (it came from an Indo-European source that also produced English mid and middle). Its neuter form, used as a noun, has given English medium, but it has made several other contributions to the language, including mean ‘average’, medial (16th c.), median (16th c.), mediate (16th c.) (and its derivatives immediate (16th c.) – etymologically ‘acting directly, without any mediation’ – and intermediate (17th c.)), medieval (19th c.) (literally ‘of the middle Ages’), mediocre, meridian, mitten, and moiety. Its Italian descendant is mezzo ‘half’, which has given English intermezzo (19th c.), mezzanine (18th c.), mezzosoprano (18th c.), and mezzotint (18th c.).