Of a medium size

(history) The period of primarily European history between the decline of the Western Roman Empire (antiquity) and the early modern period or the Renaissance; the time between c. 500 and 1500.

(geopolitics) The region between the Near East and the Far East.

The ancient or older language of Modern English, spoken in England and parts of Scotland (where it became Lowland Scots) from about 1100 AD to 1500 AD. It developed from Anglo-Saxon, also called Old English, with heavy influence from French and Latin after the Norman invasion.

The quality of being middle-of-the-road.

Alternative spelling of middle of the road

The Korean language of the 10th (or 13th, depending on the analysis) century to 16th century, or from the era of Goryeo to the middle of Joseon, based on the dialect of Kaesong because the new Goryeo dynasty moved its capital city to northern area of Korean peninsula.

(education, countable) A school which crosses the traditional divide between primary school and secondary school.

(music) A specific musical note, particularly the note C4, at approximately 261.6 hertz, appearing at the middle of the alto staff and directly between the treble and bass staves.

of, or relating to middle age; neither old nor young