Definitions
from The American Heritage® Dictionary of the English Language, 5th Edition.
 adjective Relating to, located in, or extending toward the middle.
 adjective Anatomy Of, relating to, or situated in or near the plane that divides a bilaterally symmetrical animal into right and left halves; mesial.
 adjective Statistics Relating to or constituting the middle value in a distribution.
 noun A median point, plane, line, or part.
 noun The dividing area, either paved or landscaped, between opposing lanes of traffic on some highways.
 noun Statistics The middle value in a distribution, above and below which lie an equal number of values.
 noun A line that joins a vertex of a triangle to the midpoint of the opposite side.
 noun The line that joins the midpoints of the nonparallel sides of a trapezoid.
from The Century Dictionary.
 Of or pertaining to Media, an ancient kingdom of Asia. Also
Medic .  noun Same as
Mede .  Pertaining to or situated in the middle; specifically, in anatomy and zoology, intermediate as dividing the body by a longitudinal and vertical plane: medial; mesal: as, the linea alba is the median line of the abdomen; in botany, situatedin or along, or belonging to, the middle of a structure having a right side and a left. See below.
 In crystal., same as
mean line and bisectrix. Seebisectrix , 1.  In climatology, the average central course of a tradewind.
 In botany, a nerve traversing the middle of a leaf or leaflike expansion.
 In botany, of a flower or other lateral structure of a plant, a vertical plane which bisects the anterior and posterior sides, and which, if prolonged, would pass through the center of the parent axis. Goebel. Also called
anteroposterior plane .  In entomology, the third main longitudinal vein or rib of an insect's wing, counting from the anterior border.
 Noting the middle number of a series; having as many before as behind (or above as below) a certain number: distinguished from
average : as, the median age of the population was found to be 21 (that is, there were as many persons above 21 as below it), while the average age was found to be 25.  Such a point on the x axis of the frequency polygon that the ordinate from it bisects the polygon of rectangles or the continuous curve.
 noun In geometry: A sect whose endpoints are the bisectionpoints of opposite sides of a quadrilateral.
 noun A sect from a vertex of a triangle to the bisectionpoint of the opposite side.
 noun The measure or observation which has as many of the separate measures or observations above as below it.
 noun In entomology, the median vein of an insect's wing.
from the GNU version of the Collaborative International Dictionary of English.
 noun (Geom.) A median line or point.
 adjective Being in the middle; running through the middle.
 adjective (Zoöl.) Situated in the middle; lying in a plane dividing a bilateral animal into right and left halves;  said of unpaired organs and parts.
 adjective (Anat.), (Geom.) The line drawn from an angle of a triangle to the middle of the opposite side; any line having the nature of a diameter.
 adjective (Anat.) the mesial plane.
 adjective (Geom.) the point where the three median lines of a triangle mutually intersect.
from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.
 noun the value below which 50% of the cases fall
 adjective dividing an animal into right and left halves
 adjective 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)
 adjective relating to or situated in or extending toward the middle
Etymologies
from The American Heritage® Dictionary of the English Language, 4th Edition
from Wiktionary, Creative Commons Attribution/ShareAlike License
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Examples

JIM GRANDEY, FATHER OF BLUFFTON BASEBALL COACH: About all he remembers, he remembers sitting on what he calls the median, it might have been the berm or the road up against some concrete, looking at the bus on its side and thinking, my goodness, we must have fallen off.

One of the most controversial aspects of Caplan's work is the exceptionally dim view he takes of what he calls the median voter.
Irish Election Tomaltach 2008

The term median means _____. (1 point) there are an equal number of employees earning above the amount provided and an equal number earning below the amount provided there are an equal number of employees earning above the amount provided but not an equal number earning below the amount provided there are an equal number of employees not earning above the amount provided but an equal number of employees earning below the number provided the number calculated by adding all numbers together, then dividing by the total amount of numbers

Can't Post  what does that word 'median' mean, as in median housing?

And if both spouses work, the median is more than $81,000.
The Median Household, Arnold Kling  EconLog  Library of Economics and Liberty 2009

And Krugman hardly attributes slowdown in median economic growth to Friedman alone.
An Economist or a Public Intellectual?, Arnold Kling  EconLog  Library of Economics and Liberty 2009

Change in median income from 200008 (in 2008 dollars):

The point is that one has to be careful about interpreting slow growth in median income as a failure of prosperity to be shared across income groups.
Demographics and Income Distribution, Arnold Kling  EconLog  Library of Economics and Liberty 2009

The rail line will emerge from the tunnel onto Route 7, where the median is expanding to accommodate a station.
D.C. area's road projects from bird'seye view Robert Thomson 2010

The rail line will emerge from the tunnel onto Route 7, where the median is expanding to accommodate a station.
D.C. area's road projects from bird'seye view Robert Thomson 2010
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