medium noun
1 means of expressing/communicating sth
ADJ. communication Radio is an important communication medium in many countries. | mass | print, written
PREP. through the ~ of The government communicates through the medium of television.
PHRASES a medium of communication
2 sth used for a particular purpose
ADJ. storage An optical disk is just another kind of electronic storage medium.
PREP. ~ for she used her novels as a medium for encouraging political debate. | ~ of the medium of study
PHRASES a medium of instruction (= a language used for teaching) English is the medium of instruction in many African countries.
3 material/form that an artist, etc. uses
ADJ. mixed media mixed media artwork
PREP. through a/the ~ | ~ of to express yourself through the medium of paint/poetry/drama
You can also check other dicts: medium (English, 中文解释 ), wordnet sense, Collins Definition