Meaning of “medium” - Learner’s Dictionary

medium

adjective us uk /ˈmiːdiəm/
Extra Examples
He's of medium build with short brown hair.The company owns two medium-sized factories.The property has a medium-sized garden.She's of medium height.The country has been testing medium-range nuclear missiles.

B1 in the middle of a group of different amounts or sizes:

people of medium weight
She bought a medium-sized car.
The shirt comes in small, medium, and large.

(Definition of “medium adjective” from the Cambridge Learner’s Dictionary © Cambridge University Press)