abscissa - definizione. Che cos'è abscissa
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Cosa (chi) è abscissa - definizione

NAMES FOR A SYSTEM'S TWO AXES IN COORDINATE GEOMETRY
Ordinate; Abscissæ; Abscissae; Abcissa; Abscissas; Abscissa
  • Illustration of a Cartesian coordinate plane, showing the absolute values (unsigned dotted line lengths) of the coordinates of the points (2, 3), (0, 0), (–3, 1), and (–1.5, –2.5). The first value in each of these signed ordered pairs is the abscissa of the corresponding point, and the second value is its ordinate.

abscissa         
<mathematics> The horizontal or x coordinate on an (x, y) graph; the input of a function against which the output is plotted. The vertical or y coordinate is the "ordinate". See Cartesian coordinates. (1997-07-08)
abscissa         
[ab's?s?]
¦ noun (plural abscissae -si: or abscissas) Mathematics the distance from a point on a graph to the vertical or y-axis; the x-coordinate. Compare with ordinate.
Origin
C17: from mod. L. abscissa (linea) 'cut-off (line)', feminine past participle of abscindere (see abscission).
Abscissa         
In a system of plane co-ordinates (see Co-ordinates) the distance of any point from the axis of ordinates measured parallel to the axis of abscissas. In the cut the abscissa of the point a is the line or distance a c. Fig. 1. AXES OF CO-ORDINATES. Absolute. adj. In quantities it may be defined as referring to fixed units of quantity, and it is opposed to "relative," which merely refers to the relation of several things to each other. Thus the relative resistance of one wire may be n times that of another; its absolute resistance might be 5 ohms, when the absolute resistance of the second wire would be 5/n ohms. A galvanometer gives absolute readings if it is graduated to read directly amperes or volts; if not so graduated, it may by "calibration" q. v. be made to do practically the same thing.

Wikipedia

Abscissa and ordinate

In common usage, the abscissa refers to the (x) coordinate and the ordinate refers to the (y) coordinate of a standard two-dimensional graph.

The distance of a point from the y-axis, scaled with the x-axis, is called the abscissa or x coordinate of the point. The distance of a point from the x-axis scaled with the y-axis is called the ordinate or y coordinate of the point.

For example, if (x, y) is an ordered pair in the Cartesian plane, then the first coordinate in the plane (x) is called the abscissa and the second coordinate (y) is the ordinate.

In mathematics, the abscissa (; plural abscissae or abscissas) and the ordinate are respectively the first and second coordinate of a point in a Cartesian coordinate system:

abscissa x {\displaystyle \equiv x} -axis (horizontal) coordinate
ordinate y {\displaystyle \equiv y} -axis (vertical) coordinate

Usually these are the horizontal and vertical coordinates of a point in plane, the rectangular coordinate system. An ordered pair consists of two terms—the abscissa (horizontal, usually x) and the ordinate (vertical, usually y)—which define the location of a point in two-dimensional rectangular space:

( x abscissa , y ordinate ) {\displaystyle (\overbrace {x} ^{\displaystyle {\text{abscissa}}},\overbrace {y} ^{\displaystyle {\text{ordinate}}})}

The abscissa of a point is the signed measure of its projection on the primary axis, whose absolute value is the distance between the projection and the origin of the axis, and whose sign is given by the location on the projection relative to the origin (before: negative; after: positive).

The ordinate of a point is the signed measure of its projection on the secondary axis, whose absolute value is the distance between the projection and the origin of the axis, and whose sign is given by the location on the projection relative to the origin (before: negative; after: positive).