# Abscissa

**ABSCISSA** (from the Lat. abscissus, cut off), in the Cartesian system of co-ordinates, the distance of a point from the axis of y measured parallel to the
horizontal axis (axis of x.) Thus PS (or OR) is the abscissa of P. The word appears for the first time in a Latin work written by Stefano degli Angeli
(1623-1697), a professor of mathematics in Rome. (See GEOMETRY, sec. Analytical.)

*Note - this article incorporates content from Encyclopaedia Britannica, Eleventh Edition, (1910-1911)*