Definition of medium adjective from the Oxford Advanced American Dictionary

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medium

adjective
/ˈmidiəm/
 
 
[usually before noun] (abbr. M) in the middle between two sizes, amounts, lengths, temperatures, etc. synonym averagea medium-size car/business/towna man of medium height/buildThere are three sizes—small, medium and large.a medium steak (= one cooked quite well but not too much)Cook over a medium heat for 15 minutes.a medium dry white wineChoose medium to large tomatoes.IDIOM

in the long/short/medium term

used to describe what will happen a long, short, etc. time in the future
Such a development seems unlikely, at least in the short term (= it will not happen for quite a long time).In the longer term, children of depressed mothers are more likely to suffer from childhood depression. see also long-term, medium-term, short-termin the long/medium termin the short/medium term