(in plane Cartesian coordinates) the x-coordinate of a point: its distance from the y-axis measured parallel to the x-axis.

noun plural -scissas or -scissae (-ˈsɪsiː)

the horizontal or x -coordinate of a point in a two-dimensional system of Cartesian coordinates. It is the distance from the y -axis measured parallel to the x -axisCompare ordinate

n.

1690s, from Latin abscissa (linea) “(a line) cut off,” from fem. past participle of abscindere “to cut off,” from ab- “off, away” (see ab-) + scindere “to cut” (see shed (v.)).

Plural abscissas abscissae (ăb-sĭs′ē)

The distance of a point from the y-axis on a graph in the Cartesian coordinate system. It is measured parallel to the x-axis. For example, a point having coordinates (2,3) has 2 as its abscissa. Compare ordinate.