average (constituting or relating to the average) / medium (intermediate size, degree, amount etc.) / middle (being in the middle) / medieval (of the Middle Ages)

(usually in the plural) dipped headlight (main light on a motor vehicle) / (sports) midfielder

Middle East (a geographical region comprising southwest Asia and northeast Africa)

Middle French (language)

middle finger (finger between the forefinger and the ring finger)

(Brazil, education) secondary education

Middle English (language spoken in England and southern Scotland from 1100 AD to 1500 AD)

Middle Irish (Gaelic language spoken in Ireland during the 10th, 11th and 12th centuries)

(dated) Middle Kingdom (a nickname for China) / (historical) Middle Kingdom (Egypt in the 12th and 13th dynasties)

(anatomy) middle ear (portion of the ear internal to the eardrum)