from The American Heritage® Dictionary of the English Language, 4th Edition
- n. The coordinate representing the position of a point along a line perpendicular to the y-axis in a plane Cartesian coordinate system.
from the GNU version of the Collaborative International Dictionary of English
- n. One of the elements of reference by which a point, as of a curve, is referred to a system of fixed rectilineal coördinate axes.
from The Century Dictionary and Cyclopedia
- n. In mathematics: In the conic sections, that part of a transverse axis which lies between its vertex and a perpendicular ordinate to it from a given point of the conic. Thus (fig. 1), in the parabola PAC, AM, the part of the axis AB cut off by the ordinate PM, is the abscissa of the point P. In the system of Cartesian coördinates, a certain line used in determining the position of a point in a plane.
from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.
- n. the value of a coordinate on the horizontal axis
New Latin (līnea) abscissa, (line) cut off, from Latin abscissa, feminine of abscissus, past participle of abscindere, to abscise; see abscise.(American Heritage® Dictionary of the English Language, Fourth Edition)