Longman Dictionary of Contemporary English homepage

medium

2 noun
     
medium2 plural media or mediums [countable]
1TC a way of communicating information and news to people, such as newspapers, television etc [↪ media]:
Advertising is a powerful medium.
2A a way of expressing your ideas, especially as a writer or an artist
medium for
the novel as a medium for satire
the visual media (=painting and films)
3

medium of instruction

SLL a language that is used for teaching:
English is still the main medium of instruction in Nigeria.
4

medium of exchange

PEC money or other ways of paying for things
5 technical a substance or material in which things grow or exist:
a good growing medium for tomatoes
6 technicalHPT a substance through which a force travels
Definition from the Longman Dictionary of Contemporary English
Advanced Learner's Dictionary.
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