(in plane Cartesian coordinates) the x-coordinate of a point: its distance from the y-axis measured parallel to the x-axis.
noun (pl) -scissas, -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-axis Compare ordinate

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 or abscissae (āb-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.

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