B1
in the middle of a group of different amounts or sizes
Dictionary examples:
He tried to fit his medium-sized car into a small parking space. It didn't end well! (0.0)
I ordered a medium pizza, but it was big enough to feed a medium-sized elephant! (0.0)
His medium-sized sandwich looked like a skyscraper next to his tiny salad. (0.0)
a girl of medium height (23.4)
She bought a medium-sized car. (26.3)
All shirts come in small, medium, and large. (29.2)