median (ˈmiːdɪən)  
—adj  
1.  of, relating to, situated in, or directed towards the middle 
2.  biology of or relating to the plane that divides an organism or organ into symmetrical parts 
3.  statistics of or relating to the median 
—n  
4.  a middle point, plane, or part 
5.  geometry 
a. See also centroid a straight line joining one vertex of a triangle to the midpoint of the opposite side  
b. a straight line joining the midpoints of the nonparallel sides of a trapezium  
6.  statistics the middle value in a frequency distribution, below and above which lie values with equal total frequencies 
7.  statistics the middle number or average of the two middle numbers in an ordered sequence of numbers: 7 is the median of both 1, 7, 31 and 2, 5, 9, l6 
8.  (Canadian) Also called: central reservation the strip, often covered with grass, that separates the two sides of a highway 
[C16: from Latin mediānus, from medius middle]  
'medianly  
—adv 
median me·di·an (mē'dēən)
adj.
Relating to, located in, or extending toward the middle.
Of, relating to, or situated in or near the plane that divides a bilaterally symmetrical animal into right and left halves; mesial.
Of, relating to, or constituting the middle value in a distribution.
median [%PREMIUM_LINK%] (mē'dēən) Pronunciation Key

The point in a series at which half of the values or units of the series are higher and half lower.
In statistics, the middle value of a set of numbers or data points; half the figures will fall below the median and half above. (See average; compare mean and mode.)