# Abscissa

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### Dictionary Meaning and Definition on 'Abscissa'

Abscissa Meaning and Definition from WordNet (r) 2.0
abscissa n : the value of a coordinate on the horizontal axis [also: abscissae (pl)]
Abscissa Meaning and Definition from Webster's Revised Unabridged Dictionary (1913)
Abscissa \Ab*scis"sa\, n.; E. pl. Abscissas, L. pl. Absciss[ae]. [L., fem. of abscissus, p. p. of absindere to cut of. See Abscind.] (Geom.) One of the elements of reference by which a point, as of a curve, is referred to a system of fixed rectilineal co["o]rdinate axes. Note: When referred to two intersecting axes, one of them called the axis of abscissas, or of X, and the other the axis of ordinates, or of Y, the abscissa of the point is the distance cut off from the axis of X by a line drawn through it and parallel to the axis of Y. When a point in space is referred to three axes having a common intersection, the abscissa may be the distance measured parallel to either of them, from the point to the plane of the other two axes. Abscissas and ordinates taken together are called co["o]rdinates. -- OX or PY is the abscissa of the point P of the curve, OY or PX its ordinate, the intersecting lines OX and OY being the axes of abscissas and ordinates respectively, and the point O their origin.
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### Wikipedia Meaning and Definition on 'Abscissa'

In mathematics, abscissa (plural abscissæ) refers to that element of an ordered pair which is plotted on the horizontal axis of a two-dimensional Cartesian coordinate system, as opposed to the ordinate. It is the first of the two terms (often labeled x and y, but not always) which define the location of a point in such a coordinate system. Abscissa simply is a reference to the x-axis. The term is no longer common in the 21st century.

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