median

the value below which 50% of the cases fall

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"

dividing an animal into right and left halves

relating to or situated in or extending toward the middle