mid-ordinate
Mathematics
noun
An ordinate erected at the midpoint of a narrow range of values of the abscissa; chiefly in mid-ordinate rule a method of approximating the area under a curve by dividing it into a number of vertical strips of equal width, erecting the mid-ordinate in each strip, and then multiplying the width of each strip by the sum of the mid-ordinates (which effectively takes the height of each mid-ordinate as approximating the value of the curve throughout its strip).
Origin
Late 19th century; earliest use found in Annals of Mathematics.
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