Medius
The Cyclopedic Law Dictionary · Walter A. Shumaker and George Foster Longsdorf; ed. James C. Cahill · 1922
The Cyclopedic Law Dictionary
(Lat.) In old English law; mean, intermediate; between two; a mesne; an intermediate lord; a tenant having a mesne between himself and the chief lord.
Stat. Westm. 2, c. 6.