Abscissa

n.

1.

(Geom.) One of the elements of reference by which a point, as of a curve, is referred to a system of fixed rectilineal coördinate axes.

Noun

1.

abscissa - the value of a coordinate on the horizontal axis

(mathematics)

abscissa - The x coordinate on an (x, y) graph; the input of a function against which the output is plotted. y is the "ordinate". See Cartesian coordinates.

cartesian coordinate