Median

Being in the middle; running through the middle; as, a median groove.

Situated in the middle; lying in a plane dividing a bilateral animal into right and left halves; -- said of unpaired organs and parts; as, median coverts.

A median line or point.

relating to or constituting the middle value of an ordered set of values (or the average of the middle two in a set with an even number of values); "the median value of 17, 20, and 36 is 20"; "the median income for the year was $15,000"

the number midway between the two middle numbers in a series containing an even or odd number of items