Definition of medium noun from the Oxford Advanced Learner's Dictionary

        

    medium

     noun
    noun
    BrE BrE//ˈmiːdiəm//
     
    ; NAmE NAmE//ˈmiːdiəm//
     
    (pl. media
    BrE BrE//ˈmiːdiə//
     
    ; NAmE NAmE//ˈmiːdiə//
     
    , mediums)
     
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  1. 1  a way of communicating information, etc. to people the medium of radio/television electronic/audiovisual media Television is the modern medium of communication. A T-shirt can be an excellent medium for getting your message across. The plural in this meaning is usually media. see also media, mass media
  2. 2  something that is used for a particular purpose English is the medium of instruction (= the language used to teach other subjects). Video is a good medium for learning a foreign language.
  3. 3the material or the form that an artist, a writer or a musician uses the medium of paint/poetry/drama Watercolour is his favourite medium.
  4. 4(biology) a substance that something exists or grows in or that it travels through The bacteria were growing in a sugar medium.
  5. 5(mediums) a person who claims to be able to communicate with the spirits of dead people
  6. More Like This Easily-confused plural/​singular forms bacteria/​bacterium, criteria/​criterion, data/​datum, media/​medium, phenomena/​phenomenon, strata/​stratumSee worksheet. Word Origin late 16th cent. (originally denoting something intermediate in nature or degree): from Latin, literally ‘middle’, neuter of medius.Extra examples English is the medium of instruction in many African countries. He believes tape will eventually be eliminated as a recording medium. Oil paint is her preferred artistic medium. Radio is an important communication medium in many countries. She experimented with the blog as a new medium for exploring issues. She used her novels as a medium for encouraging political debate. The gallery has been committed to the photographic medium for 25 years. The government communicates through the medium of television. the medium of study to express yourself through the medium of paint/​poetry/​drama As a political campaigner he quickly learned to exploit the new medium of radio. The internet is the modern medium of communication. Video is a good medium for practising listening to a foreign language.Idioms something that is in the middle between two choices or two ways of doing something She tried to strike a happy medium between making the questions too hard and making them too easy.
See the Oxford Advanced American Dictionary entry: medium