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1590s, from Middle French médian (15c.) and directly from Latin medianus "of the middle," from medius "in the middle" (see medial (adj.)). Originally anatomical, of veins, arteries, nerves. Median strip "strip between lanes of traffic" is from 1954.
"a median part," 1540s, from Latin medianus (see median (adj.)). Meaning "middle number of a series" is from 1883.
median me·di·an (mē'dē-ən)
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.
A median point, plane, line, or part.
The middle value in a distribution, above and below which lie an equal number of values.
The point in a series at which half of the values or units of the series are higher and half lower.