An Etymological Dictionary of Astronomy and Astrophysics

Statistics: The middle value in a sample sorted into ascending order. If the sample contains an even number of values, the median is defined as the mean of the middle two.
Geometry: The line from a vertex of a triangle to the midpoint of the opposite side.

Etymology (EN): From M.Fr. médian, from L. medianus “of the middle,” from medius “middle;” akin to Pers. middle, → medium, → meddle;
from PIE *medhyo-, from base *me- “between;” → medium.

Etymology (PE): Miyâné from miyân, → middle, + -é nuance suffix.